Vassilios provided a great experience for us. He met us at the car rental place and gave us a walking tour of the area on the way to the flat. He provided fresh fruit, bread, water, and wine. He has pre-made walking maps for all of the points of interest and promptly responded to any questions we sent him. He was very kind and professional.
The flat is nicely furnished and the view is as shown in his pictures. We would definitely recommend staying here for anyone interested in seeing the sites in Athens. Everything you want to see is within walking distance.