This is the second time I stayed at this hotel.
It is located a couple of hundred meters down on Sukhumvit Soi 20, and about 7-8 minutes walk from Asok BTS and Sukhumvit MRT Stations.
The hotel is fresh with comfortable beds and since it is a bit from the main road, rather quiet during the evenings/nights.
There is no breakfast served at the hotel, but there are several options nearby, so that is not a big problem.
Observe that some of the rooms do not have any widows. If you are not comfortable sleeping in a windowless room, it is important you check this on your booking.