It's a lovely apartment, freshly renovated. Also the location is good with walking distance to the main attractions in Athens, but still on the outskirts so you will have a quiet time while sleeping with no loud night life in the neighborhood.
Chrysa and her husband are very nice and helpful. The check in was smooth even if we came during midnight from a late flight.
However we visited in the beginning of November, and we had big problems with the temperature in the apartment, it was very cold. During the nights we estimate the temperature to about 10-15 degrees Celsius. The radiators didn't work when we were there. So we had to run the air condition on heating option, but it's not made for this purpose and still didn't help much.