The apartment has a great location, not in the middle of all the hustle and bustle but still very much close to the old town, all the sights and a subway station. It's very clean and equipped for even longer stays. Wi-Fi, kitchen equipment, heating, water pressure all good.
The bed mattress is a little on the soft side though, if you like them hard maybe chose some other place. The windows are (like most in Praha) somewhat old and do not keep all of the noise out, so if you're sensible in that regard/have a light sleep maybe chose chose some other place even further away from the city center.