Konstantinos's apartment is as central as could be! 5 min walking distance from Sytagma square and on a small street right next to Ermou shopping street. The apartment is however quiet and calm.
The minute you enter the apartment, you are struck by the amount of light in it and by it's minimalist yet elegant and comfortable design.
Konstantinos is very nice, after a brief introduction on the apartment and its rules (toilet paper and water heater), he recommended several places to visit in Athens that turned out to be amazing! He even pinned a few on Google Maps!
At the end, he was also kind to let us keep the luggage in another apartment after checkout (until late in the evening!).
Highly recommended!
N.B. there is a free wifi on the street just below the apartment in case you arrive and he does not receive your sms, he is fast at replying to airbnb messages though.