I stayed for a month, and it wasn't a good experience for me. First, I saw many rooms in the photos but when I got there I was surprised that they put me in a room that there was almost no light, no sun, I was gonna stay there for a whole month, but after a guest left I asked to be moved to his room.
Along with that, the heater was broke when I got there, so they didn't even check before, it got fixed, but it broke again. The walls are very thin and there are no rules, so only a few nights I was able to sleep because it was very noise in the corridors and in the living room. Also, the internet connection isn't so stable, I had trouble while working and some of the things that they say they offer they don't, such as towels and gym equipment.
The good sides: the location is great, the kitchen is huge and there are a lot of bathrooms. If you just wanna enjoy the city for a few days you might like it, but I don't recommend this place for long stays and specially if you are planning to work/study there.