Simon's accomodation is perfect to discover Prague, since it is very central and only 10/15min walk to central train station and 15/20min walk to bus station in UAN Florenc. A train stop is 1min walk. Also the attactions are walkable. Supermarkets and bars/pubs/restaurant are plenty in the neighborhood.
The flat is large enough for 4 persons. Bathroom and kitchen are very clean. Everything in the flat was in a good condition. Only small minus is that the walls seem to be pretty thin, since you hear, when people are in the stairwell. But this is no big deal. AND big plus is that Simon answers your questions very very fast and is always reachable.
All in all a real good experience and definitely recommended. I'd like to stay in Simons accomodation for my next visit.