Demetris's place is very beautiful and efficiently using the space. The bed was very comfortable and the bathroom very clear. Check in through lock box was very easy. The parking on premise was not available (occupied by another car), but we could park for free on the street in front of the building. The neighbourhood seems ok and there are quite some places to go out at night. It's a 10 minute walk to the metro station and from there you are in the historical center in no time.
I would definitely stay here again if I go back to Athens.