car rental

Take train from Rome to either Orvieto or Chiusi. Not sure what your intended destinations are in Tuscany, Where are you going next? The drop fee is only around $55 so better than backtracking to you pickup location. Zero deductible is readonable and I’d recommend.
Autoeurope and Kemwel or the two companies we use to reserve car rentals.

Only some major rental locations are open on Sunday. Be aware that rental office at both Orvieto and Chiusi would be closed on Sunday.
Besides the 2 Rome airports, the Roma Termini station location is open on Sunday.
Although the rental desks may be located also at the Termini station, the cars are actually inside the multistory parking structure linked below, which is attached to the Radisson Blu hotel.
From this location it is not hard to reach the freeways on the east side (A24 freeway toward Roma EST). This is probably the best option on a Sunday. Traffic in the city center should be good on Sunday morning. Once you finally reach the freeways (see the A24 on Google Maps) keep an eye for directions to FIRENZE (Florence). That is the direction you want.

ES Park Giolitti Roma Termini
Via Giovanni Giolitti, 267, 00185 Roma RM, Italy
+39 06 4470 4053
https://goo.gl/maps/4vT53yEufVs

Roberto gave you good advice.

We traveled on a Sunday from FCO to Tuscany. I think your choice depends on whether you will have been in Rome or are leaving for Tuscany directly from the airport and plan to return the car at the airport.

We set off immediately for our agriturismo in Chianti. I bought the Italy/Greece SD card for our Garmin and at home I saved a number of locations we planned to visit, including our agriturismo. As soon as we got the car, I mounted the Garmin, looked up the address to the Agriturismo, changed to km/h and headed out the parking garage.

The Garmin successfully navigated us out of the airport to the Autostrada. It then took us up the heart of Tuscany to Greve. We had been to Rome before, so we returned the car and checked into the Hilton at the airport. That evening we took the free shuttle into town and spent a lovely evening walking through the city.

BTW, we rented from Hertz since I use them extensively for business travel. Since we had reservations, we bypassed the desk and went straight to the garage to pick up our car.

Thanks ---we will spend our first 4 days in Rome , then heading for BORGO RAPALE near Siena for 3 wks . Traveling with another couple who are staying a bit longer. Right now the plan is to rent car at FCO , drive to Siena area and take all our day trips from there by car , bus , or train. Can we get a direct train back to ROME FCO from Siena or elsewhere ?? Our friends will be keeping the car for remainder of their stay in Borgo Rapale. Return flight out of Rome FCO.----J

Since your friends are using the car after you leave, make sure they are the ones who rent it. If you are planning on driving just add yourself as an additional driver.

You could have them drop you off in Bucine, at the train station,about 25 min from Rapale, and train into Rome. Or ask Fortunato to see if he has a better idea.

This is our favorite agriturismo in Tuscany, you're going to love it.

Edit. While you can find a train to FCO, it is not recommended for the day your flight departs.
Rather, arrive the day before.

jt,

You may already be aware of this, but It's important to note that for driving in Italy, each driver listed on the rental form must have the compulsory International Driver's Permit, which is used in conjunction with your home D.L. These are valid for one year, and easily obtained at any CAA/AAA office (two Passport-sized photos required, which may be provided by the issuing office). Failure to produce an IDP if requested can result in fines on the spot! Have a look at https://it.usembassy.gov/u-s-citizen-services/local-resources-of-u-s-citizens/transportation-driving/ for more information on I.D.P's and driving in Italy.

You may also want to have a look at some of the other posts here concerning the dreaded Zona Traffico Limitato (limited traffic) areas that are becoming increasingly prevalent in many Italian towns & cities especially Florence, which is almost saturated with automated ZTL cameras. EACH PASS through one of the automated Cameras will result in a €100+ ticket, which you won't know about until several months after you return home! This website provides more information - https://www.italybeyondtheobvious.com/dont-mess-with-ztl-zones .