Not good...GREAT! I haven't stayed at S/D, but I have stayed in other Westin hotels with both Heavenly Beds and Heavenly Baths. I've only had king rooms, but they have had super-comfortable, pillowtop mattresses, triple sheeting with high-thread count sheets, down and feather core pillows, a lightweight down blanket (only stayed in summer...maybe they have heavier comforters in the winter). The shams, neckrolls and boudoir pillows that decorate the bed are covered in coordinating tone-on-tone fabrics that go with the duvet. All the linens are white...which means you can tell they are clean!
At my last Westin stay, my then 9-month old son slept through the night 3 nights in a row in that bed with me and DH...something he's never managed at home!
The Heavenly Bath is great too...top-notch toiletries, great decor, fluffy towels and robes, anddouble-head showers!