We stayed in Giannis place for 3 nights. The apartment was very beautiful and well maintained; really how it looks in the photos.
Giannis was a wonderful host, meeting us at the street to help us with our luggage. He even left complimentary stuff for us like bread, wine, and a few of his grandmother's apricot jam, which we really appreciated.
The apartment has a really nice location. It's about 2mins away from everything. 2 bedroom had fantastic views, the third bedroom not so much. The dining and living area of the apartment was a plus.
Due to the location though (by the highway) it's a bit noisy at night even with closed windows.
Overall, Giannis' apartment is very recommendable. We would book again when we go back in Athens.