The apartment has a lot of space, including two really big balconies (with a lot of plants, which bring life), we enjoyed early breakfasts and late dinners on the balcony.
Also location is really good, not in the very center (which is actually an advantage with silent nights) but close enough to reach center by foot in ~7-10 min max.
Many stores, restaurants, and basically anything you might need around the location.
If we'll ever come back to Athens, we'll definitely check George's place first.