Everything was wonderful, Ondřej's appartment is small, but cozy and very comfortable for two person, city center is really near, you can take metro or tram/bus, but we preferred to walk all the time (~40 min really slow walk to Charles Bridge), appartment is located in a very quiet area, where lots of embassies are located, and there is also a large park, from where you can see the whole of Prague in its entirety. Ondřej is a attentive and caring host, and we will come back here for sure.