Great place and very central. Virtually behind the astronomical clock. Walked everywhere. Keys handing over was easy. Slight issue with getting the keys from the hotel around the corner, as the hotel lost them. Nonetheless, it was not Petr's problem. He has arranges the hotel to give me another keys for the one next door. So no trouble.
Great place and spacious as you have seen in the pictures. But if you can't deal with walking up 4 flights of stairs, this is unlikely to be your choice.
Probably better when all the building work in the public space is done! Recommend to stay if you want to visit Prague.