We spend half a week in this AirBNB in Athens. The AirBNB offers 2 bedrooms a big living room and a kitchen + bathroom. It is easily possible to stay with 4-5 people in this AirBNB. The host is super friendly and offered us the possibility to check-in late. We got a lot of great advices about what to do in the city and the host was really flexible with our requests.
The AirBNB isn't completely in the centre but its very easy and cheap to reach the city center by public transport.