The stay at Vadim's place was excellent!
It is located in the middle of Prague tourist center, just 3' walking from the Old town square and Astronomical Clock.
Vadim is a very good host, he communicate with us when we needed to, and he let us leave our luggage the check out day.
The apartment is in the 1st floor, and seems very safe.
Thank you Vadim for all, we'll recommend to stay at his place!