This apartment is a wonderful place. I stayed here for several week and had a lovely time. Eleni is a very friendly and helpful host. It is a warm, modern and clean (fully equipped) place where you can easily feel at home. The view on the front terrace is amazing and the back terrace is nice and sunny. Roller shutters ensure a good night's sleep in the bedrooms at the back of the apartment, so noise from the streets is very limited.
The location is also good, close to two big supermarkets and restaurants/bars. Access to the city centre is easy, by metro (10 min walk) or by foot (20-40 min walk). Would recommend this apartment for longer stays in Athens but definitely also for shorter trips.