We stayed in Naples in Studio Tribunali for 2 nights, only. The huge advantage of this flat was its perfect location : In the middle of the historical center, it is closed to everything and we walked everywere, as we wanted. HOWEVER, this flat and its organization isn't what airbnb is supposed to be ! Uncharming, very unpersonnal and not very comfortable, the flat was a real hotel room.
The tenants have 5 flats, so it is "complicated" and what I understood is that they were more interested in profits than in making free arrangements with us.
As they didn't agree for us to stay a little longer on our last day (our flight was at 8 p.m., we had to leave at 10 a.m.), they said ok for the deposit our luggages in the building.
BUT, of course, Italo cancelled one hour before the check-out, without looking for another solution for us. Besides, even if the washing machine is inside the appartment, if you want to use it, you have to pay 5 euros, and one of the tenant gives you the products (I unfortunately didn't read that in the description, so it was a bad surprise).
Finally, the taxes made us feel once again like if we were in a hotel room, everything that we wanted to avoid. That's a shame, because we are not complicated hosts, but as I do airbnb myself I know what I am talking about. We won't ever come back and we don't recommand.