We stayed at Sheraton Zurich Neues Schloss back in January and it was a lovely stay. It was on SPG hot escape and the rate was nearly the same as the other Sheraton in town. Upgraded to executive room as SPG platinum, and had breakfast in the restaurant. The breakfast was quite delicious. We were also given two vouchers for drinks at the bar, as well as wifi codes.
You can find the pictures of the executive room and breakfast below
http://viewfromthealtitude.blogspot....oss-hotel.html