Originally Posted by aw
The IBIS next to the Hilton should be pretty decent and not too expensive. You also have the RER station steps from it for easy access into/out of the city.
I've stayed at the Ibis a couple of times and it's perfectly fine for the intended purpose. The other alternative is to try to Priceline a room - check betterbidding.com and similar sites for hotel lists and bidding histories.