Short walk from terminal 5, and hotel is very clean and new with great modern amenities. Just there for a quick 1-night layover and it worked great (albeit pricey), but the checking process took a very long time, which is not what you want after a long travel day.
Beds were comfortable, bathrooms really nice, and for an airport hotel it was very quiet (critical).
There is a cool little grocery store between the terminal and hotel, great for grabbing ready-to-eat food and taking back to the room for some R&R. I heard some travelers with airline vouchers staying there, and the food vouchers weren't enough to cover any room service, so I'd recommend the grocery place for sure (hot and cold food, wine, etc).