The stay is exactly what is advertised on the airbnb website. It is a unique building and a lovely unit with a great outdoor patio overlooking the city. You really feel like a local. While we were there, the weather was amazing which made the stay all that much better since we were able to spend time outside and could open up all of the windows while inside. It was as clean as could be- the bathroom, shower, and bed were all perfect! You could spend a lifetime walking around the area to different coffee shops and restaurants. A big benefit to the stay is that it was close to the metro station but also walkable distance from the monastiraki square.
If you are expecting a perfectly silent night's sleep, I would suggest staying in the country, and not downtown Athens. With this being said, it did not bother us one bit and we actually enjoyed the feeling of being in a busy area.
The airline misplaced my luggage and had to deliver it to the air bnb and it turned out to be while we were on a day trip. Mike and Maria communicating very promptly and Maria was able to stick around the building to pick up my luggage and keep it safe for me. This was a HUGE blessing.
Thoroughly enjoyed our time and hope to one day own a building like theirs ;)