We had a wonderful stay at Alex and Kate's apartment. It was one of the only places we found in Prague 1 with 2 beds and 2 baths and was perfect for a few nights! The apartment was very comfortable and Ruterra Apartments could not have been more helpful from start to finish. I think the only downside was being woken by people returning to their hotels rather worse for wear at all hours - but I think to avoid that you need to avoid central Prague!