Michal and his son, Adam, were very accomodating: we arrived earlier and they did all they could to get us the apartment before 14:00
The flat is very comfy and well equipped: all is very clean (like brand new actually) and there was a real attention to detail (equipment, decoration, tourism litterature...) The street is also surprisingly quiet.
You can reach the center in 10 minutes by foot and there are 2 subway stations nearby: it's absolutely perfect!