Great location near loads of restaurants & bars and walking distance to the main sights (Akropolis, Agora, Kerameikos).
Unfortunately being near such an active nightlife also means it's quite noisy at night.
The apartment itself is spacious, but wasn't renovated to a very high standard. The beds downstairs were comfortable, but my friend sleeping upstairs developed a backache.
Aris was friendly and correct in his communications.