Bouncer,
my advice to you is to call some of the full service hotels (Mariotts, Golden Tulips, Hilton's) and ask if they have any apartments. I did the same in Amsterdam, and while you do pay a premium for the flexibility, it is nice to have a kithchen and living area in addition to a bed.
I am staying at the Renaissance, and was able to negotiate a very nice rate with them earning full Marriott Points and status.