There are two great things: Dimitris, the host, and view, the terrace. Dimitris, nice and friendly, reacted immediately and brought us small things we requested within 30 mins. Terrace, large and shadowed, provided us with true Acropolis day and night.
Although apartment is located in a very quiet small street (very unusual for the center!), there is a day and night sound from the neighbor's AC. If you easily sleep in the airplanes or never open your windows - this will not trouble you however. No other significant sounds reached us even on weekend nights. Except the church bell starting at 6am on Sunday. But it was even nice.
Thank you, Dimitris, Acropolis and Athens!