I stayed at the Four Seasons Beijing so that I could attend an exhibition. I would definitely stay there again. The club room provided a nice retreat. The staff were very helpful. The General Manager made a point of talking to me when I arrived and when he saw me as he made is rounds. You could tell the hotel was managed well.
The hotel has a very nice exercise room that I was able to access very early in the morning. I forget whether it is 24 hours, but I think it is.