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Southernmost House - Adult Exclusive

4.0 star property
The Mansion on the Sea offers a peaceful oceanfront escape near South Beach, where guests can relax by the pool or explore the nearby butterfly conservatory.

Choose dates to view prices

The Mansion on the Sea - Southernmost House in the USA is steps from South Beach. Enjoy a continental breakfast at the Seaside Cafe, ocean views, and poolside lounging. On-site shopping adds convenience, and the Key West Butterfly and Nature Conservatory is nearby.

Reviews

9.4 out of 10
Exceptional

Popular amenities

  • Free Wi-Fi
  • Air-conditioning
  • Parking available
The current price is ฿6,234
฿11,140 total
includes taxes & fees
7 Jun - 8 Jun

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Policies

Check-in

Check-in start time: 4 PM; check-in end time: 10 PM
Late check-in subject to availability
Minimum check-in age - 21

Check-out

Check-out before 11 AM

Special check-in instructions

The front desk is open daily from 8:00 AM - 10 PM
Front desk staffed during limited hours
If you are planning to arrive after 8:00 PM please contact the property in advance using the information on the booking confirmation
Information provided by the property may be translated using automated translation tools

Renovations and closures

The property will be renovating from 15 April 2026 to 31 December 2026 (completion date subject to change). The following areas are affected:
  • Exterior
Renovation work will only be conducted during working hours. Every effort will be made to minimise noise and disturbance.

Access methods

Front desk (limited hours)

Pets

Pets not allowed

Children and extra beds

Children younger than 18 are not allowed at this adults-only property; all guests 18 and older are welcome
Rollaway/extra beds are not available.
Cots (infant beds) are not available

Payment types at the property

Important information

Fees

You'll be asked to pay the following charges at the property. Fees may include applicable taxes:

  • Resort fee: USD 33.75 per accommodation, per night
The resort fee includes:
  • Beach towels
  • Concierge service
  • Housekeeping
  • In-room bottled water
  • In-room coffee
  • Pool access

We have included all charges provided to us by the property.

Optional extras

  • Self-parking fee: USD 40 per night

The above list may not be comprehensive. Fees and deposits may not include tax and are subject to change.

You need to know

Extra-person charges may apply and vary depending on property policy
Government-issued photo identification and a credit card, debit card or cash deposit may be required at check-in for incidental charges
Special requests are subject to availability upon check-in and may incur additional charges; special requests cannot be guaranteed
Minimum Spring Break check-in age is 24 years old.
This property accepts credit cards; cash is not accepted
Cashless transactions are available
Noise-free guestrooms cannot be guaranteed
Safety features at this property include a carbon monoxide detector, a fire extinguisher and a smoke detector
This property has outdoor spaces, such as balconies, patios and terraces, which may not be suitable for children; if you have any concerns, we recommend contacting the property prior to your arrival to confirm that they can accommodate you in a suitable room

We should mention

This property does not have any lifts
Pool access available from 8:00 AM to 10:00 PM
Children 18 years old and younger are not permitted at this adults-only property
Only registered guests are allowed in the guestrooms

Frequently asked questions

Does Southernmost House - Adult Exclusive have a pool?

Yes, this property has an outdoor pool. Pool access is from 8:00 AM to 10:00 PM.

How much does it cost to stay at Southernmost House - Adult Exclusive?

As of 23 May 2026, prices found for a 1-night stay for 2 adults at Southernmost House - Adult Exclusive on 7 Jun 2026 start from ฿6,234, excluding taxes and fees. This price is based on the lowest nightly price found in the last 24 hours for stays in the next 30 days. Prices are subject to change. Choose your dates for more accurate prices.

Is Southernmost House - Adult Exclusive pet-friendly?

No, pets are not allowed at this property.

How much is parking at Southernmost House - Adult Exclusive?

Self-parking is available for USD 40 per night.

What time is check-in at Southernmost House - Adult Exclusive?

Check-in start time: 4 PM; check-in end time: 10 PM. Late check-in is available during limited hours.

What time is check-out at Southernmost House - Adult Exclusive?

Checkout is at 11 AM.

Where is Southernmost House - Adult Exclusive located?

Located in Old Town Key West, this beach hotel is steps away from Southernmost Point, Duval Street and South Beach. Key West Butterfly and Nature Conservatory and Ernest Hemingway Home and Museum are also within 10 minutes.

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Reviews

Reviews

9.4

Exceptional

9.6

Cleanliness

9.6

Location

9.6

Staff & service

9.0

Property conditions & facilities
Rating 10 - Excellent. 781 out of 1000 reviews
Rating 8 - Good. 138 out of 1000 reviews
Rating 6 - Okay. 51 out of 1000 reviews
Rating 4 - Poor. 21 out of 1000 reviews
Rating 2 - Terrible. 9 out of 1000 reviews

Reviews

Verified

10/10 Excellent

BOBBY J.

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Fresh continental breakfast, clean room, close to everything.
Balcony
Bedroom
Back of house
Sunrise
Stayed 7 nights in Feb 2026
Verified

10/10 Excellent

Adam

Liked: Amenities, property conditions & facilities
Ocean view, great pool & great staff. Excellent place to stay!
Stayed 2 nights in Feb 2026
Verified

10/10 Excellent

Mary

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Historic property with easy access to everything.
Stayed 5 nights in Jan 2026
Verified

10/10 Excellent

Gregory

Liked: Cleanliness, amenities, property conditions & facilities
Excellent location, friendly staff, great amenities. Very happy we stayed there!
View from our room.
Stayed 3 nights in Jan 2026
Verified

10/10 Excellent

Noelle

Liked: Cleanliness, amenities, property conditions & facilities
Good staff, clean room, nice breakfast, good location
Stayed 6 nights in Jan 2026
Verified

10/10 Excellent

Stephen

Liked: Cleanliness, staff & service, amenities
Fun place, great location, great staff.
Stayed 3 nights in Jan 2026
Verified

10/10 Excellent

kelly

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Wonderful stay!! Comfortable bed and room was gorgeous and so clean! Most amazing and lovely breakfast and dining area inside and out. The staff were the most kind and helpful group especially Dean! We would 100% stay here again!
Stayed 2 nights in Mar 2026
Verified

8/10 Good

Elizabeth

Beautiful location. Clean and friendly staff
Stayed 4 nights in Jan 2026
Verified

10/10 Excellent

Jacob

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Great place to stay. Staff was very friendly
Stayed 2 nights in Dec 2025
Verified

10/10 Excellent

Kay

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
My husband and I stayed in room 101 for four nights. Beautiful ocean view and very quiet! Staff were all very friendly and accommodating. We would definitely stay here again.
Stayed 4 nights in Feb 2026
Verified

10/10 Excellent

Elizabeth

Liked: Cleanliness, amenities, property conditions & facilities
Courteous staff, great breakfast and wonderful ocean front location! We were able to go everywhere we wanted on foot.
Back of property
Ocean view
Courtyard by pool
Stayed 3 nights in Jan 2026
Verified

10/10 Excellent

Kathleen

Liked: Cleanliness, amenities, property conditions & facilities
Room spotless and staff were wonderful!
Stayed 3 nights in Dec 2025
Verified

10/10 Excellent

Bradley

Liked: Cleanliness, amenities, property conditions & facilities
Wonderful location, attentive staff and beautiful valentines touches such as sparkling wine and chocolates. Outstanding!
Stayed 1 night in Feb 2026
Verified

10/10 Excellent

Judith

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
The staff was so friendly and really worked together last me a family. Very hospitable!
Stayed 3 nights in Jan 2026
Verified

10/10 Excellent

Willie

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Great place with excellent staff.
Stayed 5 nights in Oct 2025
Verified

8/10 Good

Fanny Sarah

Liked: Cleanliness, amenities
Beautiful area , hotel right on the beach
Stayed 1 night in Jul 2025
Verified

10/10 Excellent

John

Liked: Cleanliness, amenities, property conditions & facilities
This property is beautiful and interesting for its rich history. The cottage rooms are right on the water. Staff is amazing and the breakfast is delicious from local bakery.
Stayed 3 nights in Dec 2025
Verified

10/10 Excellent

Renitia

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
What a gorgeous property, the mansion is gorgeous and the views were awesome. It was so nice to walk out of the property and enjoy all that Duvall street has to offer without ever needing our car.
Stayed 1 night in Dec 2025
Verified

8/10 Good

Xun

Liked: Cleanliness, amenities
Convenient location. Staff very friendly and accommodating. Nice view. Seaside cafe was great. Moondog pastries available for breakfast. Insulation probably not great and could hear roosters crowing at night even on the top floor.
Stayed 2 nights in Jan 2026
Verified

10/10 Excellent

Leslie

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Fantastic location with friendly staff
Stayed 3 nights in Jun 2025
Verified

10/10 Excellent

Leslie

Liked: Amenities
Great location and great room!
Stayed 1 night in Jun 2025
Verified

10/10 Excellent

Matthew

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
The historic feel of the mansion makes it quite romantic and quaint. We loved our stay. And the staff was fabulous!
Stayed 1 night in Sep 2025
Verified

8/10 Good

Ian

Liked: Staff & service, amenities
The history of the Mansion on the Sea and its location make it worth staying there.
Stayed 5 nights in Apr 2025
Verified

10/10 Excellent

Dawn

Liked: Cleanliness, staff & service, property conditions & facilities
The staff was excellent and our room was very clean. The location is fantastic. We really enjoyed our stay.
Stayed 4 nights in Apr 2025
Verified

10/10 Excellent

Ilija

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
It is historic hotel with great access to Duval St. It is on the shore. Perfect place to watch both sunrise AND sunset. Clean, good breakfast, nice staff.
Stayed 4 nights in Oct 2025