I and my boyfriend stayed in Vincent's apartment for a week in August. It is situated in a very quiet neighborhood at 20 minutes walk from the center and 5 minutes walk from the main station: I think it is more indicated if you intend to do some day trips than just staying in Prague.
The house is functional, well equipped and quiet clean. We had some troubles with the shower (sometimes the water was really cold) and found the bathroom a little messy. Moreover sometimes the whole apartment has a mold smell.
The communication was good and the host was very kind and available.