We recently stayed at the apartment building on 31st - as many other sites will say, this is very "no frills". You're getting a fantastic location, although the area immediately outside the hotel is a bit sketchy (weed dealers nearby on the corner). The place itself may have been a hotel of sorts at one point - there seem to be a few hosts who have several units all within the building.
Overall, the place has sort of a 'youth hostel' feel, and we saw plenty of younger travelers staying there. We are a family of 5, and our requirements dictated we have a separate bedroom as well as allowing for a small pet. This unit fit both those bills (there was a small fee for the pet).
We stayed when it was around 80 degrees in June and the bedroom stayed quite cool, where the window unit was installed. The main room less so, and we needed to keep the door open between the two rooms so as to not make my sons' sleep too uncomfortably hot.
Shower had decent pressure and temp, but the bathroom/kitchen parts are both very "NYC Tiny". Some clever appointments like plastic folding chairs mounted to a rack on the bedroom wall and a table that folded out helped to make the space more livable and provide somewhere to sit besides the 3 beds. Mini room has a double bed on bottom, single bunk on top. Bedroom is two double beds. We wound up using the top bunk as a place to store clothes, etc as space is really at a premium.
Bottom line - if you don't need fancy, if you don't expect room service, if you just need a place to crash or unwind for a minute between outings, this place does the job. Very close to one train station and about a 5 minute walk to another line.
The few times we needed to interact with the host, he was very responsive so no issues whatsoever with Fernando as a host.