I stayed here for 3 nights in mid July on a visit to see my team (Nottingham Forest) play Olympiacos, and when (not if) I return to Athens I'll hopefully be able to stay here.
The apartment is cool, and it has a nice private yard for drinks at night.
The location in Koukaki is only a 10 minute walk to the Acropolis, but literally just around the corner there are loads of cool cafes, bars and bakeries (hipster central).
The beaches are only about 10 mins away by taxi and should cost no more than €8, well worth a visit.
Loved this trip, will be back x