The flat is located in a residential neighborhood, 15 min by foot from the Acropolis.
However the sound-insulation is nearly inexistent, and you can hear any noise from the street, or the neighbors' living room. (They usually stopped around midnight, so, if you are not sensitive to noise or have earplugs, it's bearable.)
That being said, the apartment itself is in good condition, exactly as shown in the pictures, and perfectly clean. Comfortable bed (better than most in my previous Airbnb experiences), pillow, and spacious living room. The kitchen is small but well provided. Clean bathroom, no issues with water.
On top of that, it was only 280€ for 10 days, which left us enough budget to organize some last minute side trips: 2 nights at Nafplio, 2 at Kastraki, without having to haul all our luggages.
Also, Stavros was a nice host. He came to pick us at the metro station, and gave us some advice for our trip. Thanks a lot!