Staybridge Suites shares a building with the Holiday Inn alongside the Westfield mall. If you're coming by Tube like I did, it can be a little confusing to find, but once you get the hang of it it's very easy. Just remember there are three levels and the hotels are on the second! Out of the Tube station, up one level, then down the Street...and the hotel is right there.
This is a lovely place to stay. The rooms is large (by European standards), very well equipped (right down to a dishwasher and full kitchen setup), and the cleanliness and maintenance are perfect. Check-in and breakfast are on the 12th floor, with suites below. Staff was always friendly and very helpful. There is a restaurant and bar shared with the Holiday, but much better places within and short walk.