I stayed at Sokols apartment for 2 nights, the first one alone, the second one with a friend.
The apartment is easy to find, due to the good instructions of Sokol - check-in is flexible because of a key-in-locker system.
The place was as described, clean and tidy (not to big, but you can find everything you need for a short stay).
Unfortunately there was one bit BUT: The apartment is in the 6th floor of a building otherwise abandoned. Means: From floor 1-5 you have no doors, no windows, open walls, cables hanging from the ceiling and dove living and nesting. You can look the front door and if you are lucky there is someone staying in the flat next door, but nevertheless i wouldnt recomment a stay to someone hows travelling alone.