The apartment is very clean and modern. The two bathrooms were a big bonus. The front balcony is bigger than it appear in the pictures and is a nice place to catch the sun at the end of the day. It is a bit noisy on the balcony because of the nearby road, but very quiet inside the apartment. There is also a small balcony off the main bedroom.
The location is excellent. 5 min walk to metro station, 20 min walk to main attractions, taxis cost 3 or 4 euros to Plaka etc. There are shops, cafes etc very close to the apartment.
We didn't meet Olympia, but she was an excellent communicator, always available, and accommodating of a last minute change of plans.