My 50 sq.m. apartment lays in the Acropolis' area -just 15 min. walk from the Acropolis museum, 20 min. to Plaka and Monastiraki. Cool, originally artsy, calm & refurbished 3 yrs ago. Good commute. Sleeps up to 4 people (family or friends).
Koukaki is the neighbourhood of Acropolis and one of the best places to stay in Athens. A lot of sophisticated people moved in the area which is friendly, quiet, safe and extroverted.
The flat is pretty close to busses (1-2 min. walk) and both metro stations (Acropolis, Fix) are also about 10 min walk.