This hotel could be anywhere, and really only survives because it is right next door (you just cross a walkway)to departures at terminal 5. It is otherwise and ordinary and soul-less place. We were assured that we had been given an upgrade, but to what? There was nothing special about the room.
You have to put your room key (credit card style) into a slot to turn the lights on, and no one reminded us of this. It had been a while since i had stayed in a room like this and we hadn't been told at check in how to do it. Annoying.
Nice bed with good pillows, but cheap and thin towels. That stale and chemical smell in the hallways. I was especially irritated that getting on the Internet was so expensive. In this day and age that's absurd (it's free in terminal 5!) Staff was cheerful and friendly.
We came here from terminal 3 and it cost a fortune to come by cab. (Yes, there is bus service, but we were exhausted.) So the convenience of walking into terminal 5 the next morning may have been irrelevant. I'm sure there are nicer and more personal places not far away.