My son and I stayed for several nights at Giannis' house and it was a wonderful experience. Giannis was out of town and his cousin came to meet us at the metro and help us back and that was really appreciated since we were tired. As you walk from the metro to Giannis', you come around a corner and there is the Acropolis all lite up...it was beautiful. You enter the house through a beautiful front yard...there are even banana trees with bananas riping! The house and room is very comfortable and the AC was appreciated as the weather was hot.
The house is a 15 minute walk to the Acropolis and about 20 to the museum through a wonderful neighborhood with lots of restaurants a lot which have amazing views of the Acropolis from their roof top decks. There is also great out door cinema where along with seeing a movie in English, you have a view of the Acropolis! This neighborhood is rare in Athens as there are a lot of trees and parks along with historical sights. We also got a personal taxi/tour guide that was great and Giannis has his number...made it very efficient to see as much as possible in a short period of time.
As 4+ year Airbnb hosts and travellers, I can most highly recommend staying with Giannis it has been one of our best stay experiences.