I'm a solo-traveler and stayed here for 4 nights, I choose this guesthouse because of the reviews and it didn't let me down.
The room was big enough for me that I can open up my suitcase. The bed and sofa area was very comfortable and wifi signal was strong. Staff at the reception was very friendly and helpful, they even helped me to get fried chicken for dinner on the first day of arrival.
The bathroom was ok, some places can be cleaned more thoroughly like the tooth mug, and also the sink leaks a little bit. The TV signal was not very stable. The only thing that bothers me a bit was the noise, I could hear upstairs running or moving chairs.. But after 22:00pm became quiet, so it wasn't a big problem.
The location was also good, the guesthouse is not far away from the subway station, around 5-8 min. of walk. Maybe it takes a little bit longer with the suitcases... Walking to the shopping area at Hongik University area was very convenient, only around 6 min. by foot.
Overall, I like this guest house and had a good trip in Seoul!