My stay at Constantinos place was very nice :) Location is very good for visiting central places of Athens like Syntagma square, Monastiraki square, Plaka, Acropolis and so on. Everything was very clean. Only small problem I had with the apartment was that it was cold sometimes and I needed to use air condition to heat it up because windows are not so good. But I believe Constantinos is aware of this and will fix it soon :)