Alex and Kate's Ruterra Appartment is a nice place to stay in Prague because it's well place in the city, it's quite big (we were 8 persons and we felt cumfortable even if we were out most of the time), modern, well-equiped and secure with many keys.
The communication with their agency was good and we got all needed information to get the keys then get to apprtement.
A few noise in the night with some people having party in a bar in the street (we let the windows open because it was very very hot outside) - but it was acceptable (and by closing the windows everything was ok).
I recommend it because it's an aesy to live place.