I've used Air BnB nearly a dozen times now, and this was by far my worst experience. We booked a couple of months in advance, yet three days before our trip, Cesare notified us that he had overbooked the room and that he would be kicking us out a day early. Instead, he offered to put us up in different, inferior, accommodations (at our own expense, of course). He really had us over a barrel at this point, as we had non refundable plane tickets and at that late stage of the game, it would have been impossible to find another room without playing for an exorbitant hotel room. So, halfway through our trip we had to switch rooms, (at a time convenient for Casare), and that place was just awful.
If you want to visit Rome, stay with a different host.