I'm leaving France for doing a roadtrip in south america for 6 weeks.
For helping me to finance it, I let my room for anybody who needs a place next to Paris for a few days.
My bedroom is in a lovely and quite big house where are living 20 young people in 4 separated appartment. The house is very closed from Paris by train (20 minutes for Montparnasse train station).
My roomates are just greats and I have no doubt that they're gonna wellcome you the best as they can.