Perfect place to stay in Athens-- really helpful hosts, great communication, flexible and amenable to early check in. George and Agnes also recommended the Beat app for taxis which was really helpful (we used it to get to the flat from Kifissos bus station for €5).
Flat is lovely with cute retro style kitchen and lovely balcony. Bed comfy and air con effective. Neighbourhood pleasant with some decent coffee shops, restaurants etc. We'd definitely stay here again if we found ourselves in Athens in the future.