Ioanni's quarter Petralona is just excellent. Real Greek neighborhood with nice taverns in the square Pl. Ious (eg Best Taste,...)and around metro station. Same for groceries. The place has perfect location at the end of pedestrian lane, ease of access, cleanliness, amenities. Quality/price-wise it's hard to beat this apartment by almost any other, I believe.
Definitely will try to come back to it once I am in beautiful city of Athens again. Efharisto Poli again to both, your father and you, and hope to stay friends!