We really enjoyed staying at Radeks place. Actually his brother gave us the keys to the flat. He was really really nice. Just an example: The people that stayed in the flat befor us somehow managed to break the tv so he offered to get his own tv from his flat as a replacement (of course you need everything but a tv for a weekend in prague ;)
The flat was nice and clean and the neighbourhood was fantastic. They have a really nice little market just 1 minute around the corner where you can get everything you need for a perfect breakfast.
Walk to the old town is approx 25 minutes (which i recommend) but there also is a metro station and several tram stations just around the corner to get you to the very center in a matter of minutes, too.
Highly recommended!