If you want a place in the heart of Athens, this is it! We loved the location and the views. Great places to eat and shop are right in the area. Also, reasonable walking distance to sights and getting on busses for tours is close.
There were quite a few stairs to the 2nd and 3rd floor bedrooms. This was not a problem for us but may be for others. Kinstantinos was very nice and explained everything well.
Most challenging for us was our taxi finding the location upon arrival.
I would recommend Kinstantinos place.