My stay at Panos' was perfect. His father welcomed me very well, and was extremely nice and helpful. The place is large, with a very big terrace, and the home is cosy and clean, with everything you might need and even more (breakfast etc.). I slept very well. It's close to strategic spots in the city. I came for work, and was 10 min away by foot from the conference place. It is also close to metro and others.
The building is calm and the neighborhood is also quiet (to Athens standards i'd say).