Grat place! On a time when you barely meet your host and the administrator just drop you the keys, Calypso was welcoming and very friendly instead. She has a really wonderful apartment, with cute decoration and all the equipment you may need during your stay, she was always available and kind, we really enjoyed our time there.
TIP: the apartment is located in Exarchia, on a pedestrian street, there are cafés, some restaurants and a small supermarket around. If you come from the airport I recommend to take a taxi (fix price 38€) to street Tositsa 17. The nearest Metro station is Omonia (green line) the tickets from the airport cost 10€, and you still have to walk around 15 min to the apartment or take a taxi if you carry your luggage.