Everything about Petr's flat was awesome. It was a simple 40-minute commute via public transportation from the airport. Very spacious with 2 beautiful balconies, tons of windows, and 3 large comfortable beds that were big enough for adults to share, plus 2 couches that you could easily sleep on.
The Wifi and hot water in the shower both worked great the whole time which was very important to my group of 6. The location was perfect, located just a block away from a Old town square which was flooded with bars, restaurants and cafes - it was also only a 20-30 minute walk to any of the other great sights to see in Prague.
Although we never actually met Petr, his girlfriend let us in at check-in and told us everything we needed to know! Petr continued to stay in touch through our stay and made sure we were having a good experience. They even left us a few snacks!
I could imagine a better spot to stay in Prague if you have a group of 3-6 and don't mind walking up a bit of stairs.