We used Sixt car rental last September in Italy and we found them to be the cheapest of all the car rental places. They provided us with a very comfortable suv/van at the Rome airport and we dropped it off on our way back in central Rome. We had no problems getting the car but we did get some mixed messages when we tried to extend our rental for a couple of extra days. We tried doing the extension on line and it didn't work at all. We were initially told that there were no cars available, but after several phone calls by the staff to L.A. and between my husband and the Rome personnel we were able to get the extension. I would book the car way in advance of your trip as quite a few people tried to rent a car from them at the airport and they had none available.

Hope this helps. Etta in Toronto