A really beautiful space--open, light, very comfortable. We only stayed 3 nights but it would have been easy and pleasant to stay for weeks. The furniture and decorations were very nice, everything was clean, and the host was very easy to communicate with.
The location is also perfect--right in the heart of things, but on a quiet alley. It's right above a restaurant, but we never had problems with noise (and the food was very good). The bedrooms are towards the back of the apartment, and stay dark and quiet. The living room/dining room/kitchen area gets tons of light from the floor to ceiling sliding doors, and there's even a little balcony to sit on.
A really perfect spot in the heart of Athens. Would absolutely rebook again.