Positives:
Apartment is in ideal location, walking distance to all central historic sites, Plaka district, etc. View from the balcony is... you can't get it anywhere else! The picture in the description is totally real. All in all, the place looks exactly as on photos.
Athanasios was fabulous host; we felt we checked into 5-star hotel, he allowed very early check-in, was waiting for us in the apartment, communication with him was very efficient and clear. He also had some basic food for us upon arrival (eggs, yoghurt, orange juice etc) which was very thoughtful. Kitchen is fully equipped. We used rental car during our stay to drive to Poseidon Temple and had no problem parking it right next to building entrance (for free).
Negatives... hard to think of any... maybe this one - if you're more than a couple and someone is sleeping on a couch in the dining area, you will notice that there is no door between your bedroom and dining area; which was totally fine with us but it would be good to know in advance.