This is a great flat for anyone planning a stay in Prague. It's only 2 minutes away from Wenceslas Square (and Museum metro station) and it's a great location to explore Prague from. There are a lot of restaurants nearby and small grocery stores. Flat itself is very spacious and convenient for a couple, or as we did - couple + friend. Flat was super clean and well equipped. It was easy to get it warm even in the winter. František responded very quickly and he was nice enough to wait up for us, when we requested a very late check-in. Only downside and a warning I would give - don't expect to work from there, as cell reception is really bad and it affects both the WiFi in the flat (it's a mobile router) and ability to set up your own hotspot.
Overall a great place, definite worth recommending.