Very good location, in the middle of action. it's very easy to go to and from the airport as the Monastiraki metro station is just around 3 minutes away from this place. The flat itself was clean, has everything that we need. Kostas is very friendly, helpful and always responsive. (Thanks a lot for the NYE tips!).
A lot of things to see within walking distance including the beautiful Acropolis as well as Syntagma Square.
Last thing but not least, the view of Acropolis from the rooftop is amazing!
We really enjoyed our stay at Kostas' place.