Have a 6:40am flight out of DBV. Anyone has experience with after hours car rental dropoff at DBV? On their web sites, Avis and Sixt both say they have after hours key dropbox. Not sure if this is wise as there are horror stories of getting upcharge for minor pre-existing scratches. So a little worry about not having a car rental agent staff looking over the car and "sign-off".
The other option would be return the car earlier that night and find hearby airport hotel (or in Cavtat) with shuttle/taxi. The risk with this option is counting on shuttle/taxi at 4:30am. This will be in Nov so couple of the bigger hotels (with concierge) are closed.