The apartment is well located, right next to the Acropolis (1-2 mins’ walk), 10-15 mins walk to other neighborhoods. I even walked to Kolonaki for diner every day (20 mins). A lot of restaurants and bars recommended by Lonely Planet or Michelin are also located in the neighborhood.
The apartment itself is flawless. Very luminous, very lovely with a balcony.
Chris is very reactive too. He gave me plenty of advices on what to do in Athens and his guide is useful. During the stay there was once a problem with the wifi, I told him at night and the problem has been solved in the morning the day after.
In summary, a big + for your stay in Athens if you choose this apartment.