In London I enjoy the Park Tower. In Paris
Starwood is nil in my book. If you don't care about money try the new Park Hyatt. Many good comments in press and good location. Since you should care about money every two separate stays at a Hyatt paid with MC gets a free night at yes the Park Hyatt. I just booked 3 Faster Free Nights at this Hotel in 2003. The other Hyatt in Paris is also considered "cool" and "hip" but not participating in FFN. Just my opinion.