Very nice room in a private building in Thissio neighborhood, in a nice and quiet area. It it close walking distance from Thissio station, with many cafes and restaurants and I could explore the whole city and all interesting places to see (Acropolis...) by walking.
Giannis is extremely helpful and showed great hospitality! He made my stay very comfortable. He not only picked me up at the metro station when I arrived but also called me a taxi to the bus station very early in the morning when I left Athens.
I can only recommend staying at Giannis house.