We rented a car from Hertz in Florence (Via Borgo Ognissanti site) on 6/23/14, had difficulty getting out of Florence, but after about 1/2 hour, were able to get on the freeway to drive to Montalcino. The car was returned 24 hours later (2 hours of that were spent driving around Florence trying to locate the rental car agency again- NEVER rent from a location in the middle of a big city!). Amount agreed upon was paid (on credit card).
On Sept. 3rd, we noticed an additional charge to our credit card from Hertz of 42.70 Euro ($56.52). When we contacted Hertz, their response was that they had to charge an administration fee of 42.70 Euro because they had been notified by "authorities" of a violation by that car. We requested a copy of that violation as we know we had not committed any traffic or moving violations during the 24 hour period that we had it. Hertz's response "Hertz is not provided a copy of the fine. We can advise you the infringement occurred on 6/23/2014 at 15:06."
We did the paperwork for the car at 2:32 pm. We were not in possession of the car and driving it off the lot until 3:00. That means that within 6 minutes we had committed some violation.
This is quite the scam, either by Hertz and/or by the Italian authorities, rent you a car and months later tell you did something wrong, can't tell you what it was, but you're being charged for it. Also, in Hertz's response, they said "when notified of the violation, Hertz provides the local authorities with the renter's contact information based on who had the vehicle out on rental at the time the alleged violation occurred." and that the local authorities have a year in which to contact us with THEIR fine (for the made up infringement).
Will never rent from Hertz again.