I've stayed there three times as an American diamond, always points stays. This is a good redemption property.

Never had a suite or exec room upgrade. Last time I was there I was told I was upgraded to a deluxe room on the top floor and it seemed a little bigger than the previous rooms I've had. They couldn't give me an exec room upgrade but it was new years eve. First stay I asked for an upgrade at check in and they couldn't upgrade me but gave me free dinner from room service which I appreciated more than an upgrade and they offered to upgrade the last 2 nights of a 4 night stay but I didn't want to deal with packing my stuff and unpacking.

The only other hotel in London I've had experience with is the Trafalgar. No upgrade at the Trafalgar either. When I stayed there the breakfast was great, continental buffet and was told I could order anything off the menu I wanted as a diamond but I heard that benefit went away.

Exec lounge is good but small, they still have spirits at happy hour. I love the location, near a lot of theaters, shopping, and the underground for covent gardens is only a few minute walk and no transferring trains to and from LHR