Great location just down from the Acropolis museum and near a lot of tourist bars and restaurants, however, the immediate area in front of the flat is extremely quiet and we never had any difficulty with noise whatsoever. To be so centrally located and so quiet it very unusual.
The apartment was great - a large living area with everything you need, the bed is comfortable and the Wi-Fi pretty fast. No problem with check-in or anything else. The roof terrace is enormous and great to make use of.
All communication was speedy and without problems. I would definitely recommend.