We had a very nice stay at the apartment. The location is very central (in the old town), it is in a quiet area on a small street and groceries and restaurants just downstairs.
The apartment is cozy and has everything you need. We especially have appreciated the espresso machine.
The communication went smoothly, the hosts replied fast, clear and were flexible with the checkin time, which was a great help!
A tiny downside is that the apartment is at the top floor (maybe 3rd or 4th floor) and there is no elevator. There is wifi, but the speed is not great (we noticed this problem in general in Czech, or maybe we were just unlucky).

Would definitely stay again here when visiting Prague.