We were very satisfied with our stay. The host was very helpful and nice. The appartment apsolutely met our expectations: spacious, clean, sheets and towels provided. Even tea, coffee and milk was there. We walked less than 5 minutes to the sight seeing area of the old town on the hill (area surrounding Pražský hrad Castle).
The only one think which we did not liked (but it is not host's fault :-)) - is that the temperature in the appartment is getting very hot. Although outside was rather chilly (mid of May 2016) with 12-18 degrees I suppose. I think it is because the sun is shining all day long through all 3 windows. So in summer it must be super hot inside and you will most probably have to sleep with open windows (in this case do not forget ear plugs - as the tramway passing outside can be bit loud).