Any suggestions for reputable hire car companies in Nice
I thought you were driving from Paris TO Nice. Are you going the other way?
As long as your rental will be for at least 3 days, I suggest you go to the AutoEurope or Kemwel sites and compare their offerings. We've used several of the companies they do business with and never had a bad experience in France. I go for the lowest price for the type of car I want.
Unless you hire from a guy in the back of a garage, I can't imagine there would be any DISREPUTABLE companies if you've heard of them.