We had a great 2 night stay in Costa's flat. Costa was very quick to respond to messages and was kind enough to greet us at the flat when we arrived at midnight. He also took the time to tell about about Athens basics, pointing out key locations on a map, and also in a recommendation book he made himself. We also really appreciated that Costa printed our boarding passes for us as our airline did not accept mobile passes. Location was very good as well. Thanks Costa!