I see on another thread that you think you need the 4 wheel drive to get to your villa. Never rented a 4 wheel drive myself, but suggest you just go with one of the sponsors.
Make sure that you confirm that whatever vehicle you rent is 4 wheel drive. We have rented SUV's on the island but they have all been 2 wheel drive - something rarely seen in those same models in the states. Don't assume that because it is an SUV that it is a 4 wheel drive - that has not been our experience.