Perfect is the word to describe the flat. Location is (on foot) just five minutes from Charles bridge, and ten minutes from the castle. To get home from public transport is also a five minute walk.
It is a big home, with good heating to keep you comfortably warm if it is cold outside, and in a quiet building. We didn't miss anything during our stay.
There are some restaurants and grocery shop very very close.
It has been really a pleasure to communicate with Pavel: From the beginning he has answered our questions very quickcly with all (and more) information that we needed and also some advices.
If we return to Prague we will try to repeat our stay in this house. 100% recommended.