We stayed for 8 days and thoroughly enjoyed both the apartment and its proximity to the main attractions of Athens. Plaka, Akropolis, Lycabettus Hill, several museums etc are all easily walkable (Plaka 15"). The area of the apartment itself is pleasant, particularly if you want Athens populated by Greeks as opposed to tourists.
The apartment itself is a very good size, it was spotlessly clean and we found everything that we needed was provided for.
When I next visit Athens I hope it will be available.