If Evan's place is available then i wouldn't hesitate to stay there. It is in a fantastic location right in the heart of Plaka but on a side street so at night you can sleep with the windows open and it is quiet. You are a few minutes walk from the Acropolis and other amazing sights and museums as well as the shopping district, cafes and restaurants.
The apartment is very clean and the beds very comfortable with good quality linen.
Highly recommended and we would like to stay again.