Well, if you want the best bang for your buck stay next door at the Prince de Galles as we did last week. They are giving 40% off rates for stays of four nights or more. We had a superior room for $313 a night (dollars, NOT euros).
And it was easy to take advantage of the thing I like best about the Four Seasons--the bar and restaurant. The restaurant is among the top five in the entire city now. The hotel money we saved paid for all our three star meals during the trip.