The apartment is located in Koukaki area, which for me is the best area to stay while visiting Athens.
It's only a 10 minutes walk from Syngrou Fix metro station, and there are many tavernas, nice bars, little shops around. Filopappou hill is also nearby, great to walk around in this green area.
We were positively pleasantly surprised how quiet it was in the apartment. The mattress and sheets were amazing. Nicely decorated and very clean. WIFI was working well, and friendly neighbours.
Also, the checkin instructions were very clear.
Thanks Angela!