We had a great time at the apartment and were there for 5 nights. The location was awesome, near very good local restaurants and bars where we went quite often.
Communication with George was great, he replied very fast and was helpful.
The balcony was large and facing north, so in the shadows. Which was really really great, because otherwise it would have been too hot!
Some small remarks: the bed was quite old and not completely straight, so we had the feeling of rolling off.. And we had to cook some evenings, but the kitchen is very basic and not completely equipped. We missed some things like cooking pans, a not super blunt knife, a tea towel (to dry the dishes) and a hand towel (to dry your hands)...
But overall we really enjoyed Athens and the apartment. Especially with the suggestions of George. Would recommend, thank you!