This is indeed a nice, cosy apartment, in a quiet neighbourhood, but not too far away from the tourist areas. We stayed here, a family of three, for 3 nights. There are restaurants and mini markets close by and the tram/metro stops are also not too far, even though we did not try them out.
Alena picked us up from the train station and took us to the apartment, showed us the basic amenities and left us alone. Her tips on exchanging money in Prague and avoiding the tourist traps were very valuable.