My girlfriend and I spent 4 nights at Frédéric's place and are very happy to have chosen so!!
Communication with him was quick and with clear information. The room is plain, yet very comfortable with more than enough space for two people. The sun shines through the window in the morning, which we found to be quite nice :)
The apartment is located conveniently ~20 mins by Tram from the city centre and 25 mins to the main train station. Night Tram connection is also available.
Most importantly; Frédéric is a very warm-hearted, welcoming host with many great tips for Prague and interesting stories to share. We will remember our holiday fondly :)