I stayed in Michalis' place this summer. It is one of the best neighborhoods in the city, quite, residential, but at the same time in vicinity of a lot of cafes, restaurants, bakeries, convenience stores. The place is also close to two metro stations on the blue and green line--one takes you directly to the port of Pireaus, the other to the airport, so connection wise the place is really convenient.
The place is very large, and can accommodate a lot of people comfortably. The space in general is very large, but with new and effective ACs the space gets very cool in hot summer days. The host is very responsive and helpful when you need any help. I enjoyed this place and I recommend it to anyone, especially larger groups that needs lots of space. Oh, and i forgot, there is a huge balcony that goes all around the apartment.