Celine
I wouldnt think it would be a problem but the car hire sites hsould have the license requirements. Roger will probably be around soon so should be able to advise.
I do know I have a French guest who has stayed with me twice now and hired a car on both occasions but dont kno if she has some sort of International drivers permit as well.
I think you'll find you will have a much better holiday experience with a car as you are much more restricted without if you just want ot go somewhere different or even for eating etc you dont want to have to be tied to timetables imo.