Nasos's place is in the perfect location and is a great value. It was very clean and he was incredibly helpful with transportation to and from the airport (arranging a taxi for less than what our friends paid from their hotel). He met us at the apartment when we arrived, quite late at night, and gave us a map along with suggestions as to what to do. The apartment was simple, and the shower is not so comfortable to use (very small), but the place was quite adequate and a good home base for exploring Athens.