Gites de France is the oldest, more reputable one. it's been around fo decades.

We've used Simply Perigord on the Dordogne region.

By any chance has anyone used a non AirBnb/Vrbo rental agency to rent a luxury house or villa in France? Looking mostly to stay in the environs of Bordeaux but open to anywhere. We've used Provence Holidays in the past but can't find a similar agency in other regions.