I really liked Jarin's place. It's location is a little bit away from the central part of Prague but because everything is so walkable it didn't feel that way. From here I felt that I could get to the west side of Prague or Old Town within a 20 min walk. The room itself is very simple, but spacious and clean. The rest of the apartment is shared (e.g. a small sink / kitchen, and two bathrooms) but note that there's no real common area. Make sure to check out the islands in the river close by, very peaceful places to lie down and relax!