I've stayed there several times. Pretty much agree with Absik001's assessment, although it's a little longer (40 minutes) getting to central Paris on the RER. If you are staying a few days, I would recommend staying in the city - more convenient. The Paris RER/Metro will take you just about anywhere in the city - fast and efficiently.
The hotel is excellent. Every visit as a Hilton Gold has been upgraded - once to a large corner suite. Staff is extremely friendly, helpful and courteous. Once when I had an early a.m. departure, I went to the lounge a bit early, before the buffet had been set up. A staff member apologized and asked what I wanted and proceeded to go downstairs to the restaurant and prepared a plate for me.