Josef is a fantastic host who goes above and beyond with providing information about everything you need to see, eat, and do in Prague. All of his suggestions were spot on and the apartment is in the perfect location - the middle of everything.
The amenities are everything you need, especially air conditioning if you're going during the hotter months. The bathrooms were very nice in particular. This place is so much better than a hotel and such a deal too - for a family of 3 it was $300 usd or more a night at a hotel.
I know some people have expressed concern about the noise in the apartment. Please realize you are in the center of old town with cafes and bars everywhere, as well as centuries old landmarks and cobblestone streets. People are out late and you can hear them. If you are a light sleeper I suggest bringing ear plugs or headphones, but for us we were so tired from seeing Prague we needed no help to fall asleep.
This place is amazing!