It's really good place to stay but have some things can be inconvient.
First of all - you have only one set of keys, so you cannot split the group during your stay. Also you cannot leave the building without the keys.
Moreover, we haven't expected so small towels - pair of face towels is not enough for an adult. Some of furniture were broken (shower door, wardrobe in one of the rooms).
Also more cutlery, utensils and other utilities (such as soap) will be appreciable - there was no enough plates and mugs.
Nonetheless, I can recommend the place for a short stay. We enjoyed our time in Prague and this well designed apartment.