When renting car in Florence and given the fact that there are ZLTs(areas where you can get an expensive ticket if you inadvertently enter those areas) , would it be better to rent from Avis at Firenze Airport Vespucci and travel to SR 222 south to Siena or rent from Avis @ Via Borgognissanti and go south? We're staying in a hotel 2 blocks from Duomo and would take a taxi(I guess?) and proceed directly to the car rental agency. Taxi rates are greater for travel to airport than Borgognissanti, but is it more difficult with ZLTs from Borgognissanti?
Thanks for any input you might have.
Bob