There are too many good things to say about this apartment!
For one, the host Aristides is wonderful. Our plane was delayed very late (1 am), and he was kind enough to arrange a transfer from the airport to our apartment, and had someone waiting for us when we arrived to check us in and show us the apartment.
The view of the Parthenon from the apartment balcony is incredible -- the photos do not do it justice.
The location is very convenient too -- there are restaurants immediately upon walking out the front door (and Aristides gave wonderful recommendations!). The Acropolis is a three minute walk from the apartment, and there is also a metro station and bus stop close by. The tourist center for more restaurants and souvenirs, Plaka, is a five minute walk from the apartment.
Finally, the apartment itself is gorgeous. There are so cool art on the walls - it feels like walking around in a modern art museum! I would highly recommend anyone visiting Athens try to book this apartment and Aristides as a host.