This is a great apartment.
Venia was extremely helpful and communicative.
The location is perfect: the apartment is situated in a dense but residential neighborhood that has plenty of restaurants, cafés, bars, etc., but is only a 15-20 minute walk from Syntagma Square and the Acropolis.
The apartment itself is very nice. It was spacious, clean, and well-furnished. It also features solar-heated hot water, which means that hot water is available on demand--something that is not always the case in Athens, where many apartments rely on small hot water heaters that must be turned on and off manually.