Very close to the airport. We had a rental car so we didn't use the shuttle service. We had a family of 4 and paid about $150 for a night in a really large suite with a bedroom with 2 twin beds and a living room with a pull out sofa (which had been pulled out and made up for us) and a kitchen. The pull out sofa isn't particularly comfortable, but we were very tired and slept fine on it anyway.
The front desk people are mostly unfriendly and unhelpful. Several large bus loads of Asian tourists arrived while we were there, so it is definitely a popular place with the tour-group companies
If you happen to notice a very strong odor outside, it's because there is a pig farm nearby. Somehow, finding out what the smell came from made it less noxious to me and my family. Hey, pig farmers have to make a living too ;)
When we checked in I felt unwelcome. I was given a cheesy-looking police paper by the unsmiling woman at the front desk to fill out for all 4 of us, having to give our addresses, phone numbers, emails, birthplaces and dates (!), nationalities etc. But none of the other people checking in while I was there were made to do that. They gave us one room card for 4 people. You need the card to operate the elevator, turn (and keep) the lights on in your room, get into the parking garage etc. So really? One card?! Do yourself a favor, insist on a card for each person before you go up to your room. I ended up doing that, eventually. We had to figure each thing out the hard way, as they wouldn't volunteer one iota of information. They didn't tell us JACK. Like, besides the small parking lot (which didn't have even one open space) there is an underground parking garage, which you may not notice at first, and there is a way to get into it, but we had to ask and experiment and drive around a few times to get it worked out. We didn't even know if we were allowed to use it, or would be charged etc. We had to ask an employee who happened to be walking through the parking lot.
If you have a rental car you need to fill with gas before you return it to CDG, or something that has to be mailed, do yourself a favor and do it before you go to the hotel! Finding a post office or a place to get gas around there is just a massive PITA.
I'd stay there again, because of the nice room and proximity to CDG, now that I know how it all works. I would simply be forewarned and prepared not to expect any basic kindness or help from the front desk people.