My family of five stayed here for three nights and had a wonderful experience. The location cannot be beat - it is a three-minute walk away from the main public square in Prague and situated above one of the best coffee and pastry shops in the city. There are fabulous (although expensive) designer shops right around the corner. Despite the fact that Prague can be quite noisy at night, we did not have any issues with noise during the evenings. We paid a little extra to have a transfer service pick us up from the bus station and bring us directly to the flat, where Romana was outside waiting for us with the keys. She was very pleasant and friendly and answered our questions about WiFi, best places to eat, etc.
We had just two small complaints about the flat - the beds were a bit uncomfortable and quite lumpy and they ought to be replaced because it made for some very sore backs in the morning. Also, the TV was broken, but since we spent all our time sightseeing, we really didn't mind.
Overall, we were very happy with our stay and would definitely rent this place again if we come back to Prague!