Leasing a car for 21 days or more is sometimes more economical than renting and has other benefits such as the inclusion of CDW with no deductible in the lease. If you go the AutoEurope website, you can learn what the comparable costs would be and see if a lease is right for you. I just checked and the price for a Peugeot compact would be $928. A rental for the similar size car would be about half that or less. Here are the rates from EuropCar for a Fiat500L:
Basic Rate
Rates starting at ...
$331.07
Inclusive Rate w/ Deductible
Rates starting at ...
$414.98
No Deductible Rate
Rates starting at ...
$477.21
Most credit cards do not cover CDW in Italy. Check with your credit card issuer to determine your coverage.Each individual card has its own rules. Points I can't address are: if you rent a car in a France a) Will you violate Italian law regarding CDW if you use your credit card for coverage? b) Because of the Italian requirement will you be covered if you do have an accident? Call Auto Europe on their toll-free number and talk to one of their associates. I have found them to be very knowledgeable.
Returning a car to CDG isn't a problem and will not incur a surcharge. Surcharges are normally added at the pick up location. If you can avoid driving into Paris the traffic to the airport should be manageable.