We stayed for a couple of days in Jan's apartment and we can only recommand you to book it.
The apartment is super clean, in the shade which is a plus when you go to Praha during a hot summer and perfectly equipped.
Jan was very attentive with a lot of tips and eased us our movings through Praha.
Breakfasts at the restaurant were pretty good and is a plus for your stay.
The apartment is well located in the city, we could reach the center in 15 mins approximately.