I stayed in probably their worst room, a single room without window and ventilation, a problem they solved with a ventilation duct over the door, directly to the hallway. This made it verry noisy, as all walking and talking in the hallway felt like it was happening in my room.
I shared a toilet in the hallway, but not with too many others, I never had to line up and wait, not shure if anyone else was using it during my stay.
I would recommend this to others, but don´t book the single room, the others looked like having proper ventilation and windows, and no open holes to the hallway ;)