Are you looking for accommodation during the Paris-Brest-Paris? The Tourist Office offers a list of bed and breakfasts about 30 minutes from Rambouillet.
Dourdan and its surroundings
DOURDAN
Room of the Castle – 06 78 07 13 28 / 09 54 84 60 86
Suite Bel Air Suite
The little house in the Jardin d'Apollon – 06 60 75 46 32