This is one of the best place I have ever stayed. It is extremely clean, equipped with all the amenities and with a wonderful host who responds instantly to any questions. She really cares for you.
The flat is very specious, with a big veranda and balconies in every room. Most importantly, if you are not from Greece, the flat is, itself, a cultural place, as it is decorated in a very Greek way with old furniture pieces, paintings and small items. It is also extremely close to the center of Athens, around 20 min walk.