They only give you 1 key for the whole family. Even is there are 4 adults renting on two bedroom apartment. And since you do not have any access to elevator or even to stairs without that room key you always have to have that one key on you on you. If it is locked, the room doesn't open from inside without the key as well. So the problem is that if one of the family leaves the room that person has to take the key with him to be able to leave and to come back, but the rest has to remain in the room without ability to leave, to use elevator or stairs or even make it to the underground parking.
I was constantly worried about my husband and toddlers when I left them in the room locked(for the night time), that they wouldn't be able to leave the room in a case of fire.
I have no idea how that could comply with the fire safety: If there is a family locked inside a room, who wouldn't be able to leave in a case of fire or any other emergency.
They at least have to allow for all the adults that rent their rooms to get a separate key.
Another thing is that they do not clean. So you have to figure out as a tourist staying there for more than a couple of days on how to clean your room, or how to get fresh towels.
The good thing is the Sossier restaurant and Otrebusy bakery right next to the to the building, so you can always get fresh and tasty and not too expensive food to you room while wearing pajamas. Which is very convenient.