Very nice place, very convenient, near the beautiful pedestrian area around the Agora, near Thissio metro station and the many restaurants. Most central places for sightseeing are within walking distance, such as the Roman Agora, Acropolis, Areopagos and Philopappou Hills, Monastiraki, the Kerameikos/Gazi nighlife district.
The apartment is quiet, clean and spacious and Alexandros is always helpful and very quick in responding.