For me, along with how many nights this year
1. Sheraton Park Lane (23 nights)
2. W London (6 nights)
3. Park Tower Knightsbridge (6 nights)
4. Aloft Excel (2 nights)
5. Le Meridien Piccadilly (3 nights)
I like the W. It's certainly a lot of fun on weekends, even if the minimum table charge in the back room is somewhat expensive. Easily covered with a few bottles of vodka though