My stay in Athens was perfect, mostly due to Kiriakos and Marsia's flat.
Well-located (just down the Acropolis hill), you can do everything by walk - no need to use the public transport ; and from the airport, it is direct with the Tube (with just one real quick change).
The flat is nice and clean as advertised ; well-equipped and the air con was efficient and above all life saving in September ; no noise at all from the street.
Kiriakos was extremely helpful and responsive when I need.
Definitely a place that I recommend to anyone ; and that I will book again if I happen to come back to Athens :)