My wife, 15 month old daughter, and I stayed at this apartment for 3 nights. We really enjoyed our stay.
Communication, check-in, facilities etc were all fantastic, as were some of Tereza's local tips...especially the bakeshop for coffee and pastries in the morning. The location was particularly good...a couple of minutes stroll to old town square, and 15 minute stroll to Charles bridge.
Only two very small issues...the elevator in the apartment block is very small (assume this is in keeping with the age and style of the building). Also, there's a bit of noise at night from the bars downstairs. Though we weren't overly bothered by it, and the bedroom at the back of the property (where our daughter was sleeping) was very quiet.
Overall, we thoroughly enjoyed our stay and would recommend this apartment to anyone heading to Prague!