I can recommend the Hotel du Theatre http://www.hotel-du-theatre.ch/E/hotel/default.htm

It's cute but may not be up to your style. We stayed there in 2001 and it's a short walk, even with luggage, to the haupbahnhof (HB), which will make it easy to get to the airport in the morning. It borders on the Old Town with its galleries and it's also pleasant to walk along the Limmat river at night: http://tinyurl.com/26wu4

If you like vegetarian, try the Bona Dea restaurant next to the HB - it's one of the best I've seen and great ambiance.

Cheers, Pat http://www.ualberta.ca/~pletendr/swiss/