My husband and I stayed in Kira's appartment (5th floor, elevator available) for 3 nights. Beforehand Kira was always quick about answering any occuring questions even prior to booking. At the appartment complex the receptionist was very friendly and gave us helpful recommendations as it was our first visit to Prague. The appartment itself was beautifully furnished, light, spacious and very clean. A cleaning lady made sure of the latter every day. For those who are worried about their valuable belongings there is a safe in the closet.
The location is convenient since you can reach all the interesting destinations by foot, we didn't need to use public transportation or taxi even once. There is a supermarket right across the street in case you want to cook something for yourself.
I would suggest to tall people to ask whether there is an appartment with a shower available instead of a bathtub. Showering in the tub was ok for me, but for my 1.90 m tall husband it wasn't too comfy due to the pitched roof.

In a nutshell the appartment was definitely worth its money. The service was great and we felt safe. 10/10 would book again.