Sorry that I am going to miss it, but if you're meeting at the Sindelfingen Marriott, you're right near a great eating place:

Leave the Marriott. Turn right when you go out the door, and walk down to the next intersection (it's a "T" with the leg of the "T" to your right), turn right and walk until you reach the end (a couple blocks). It ends in a "T" intersection, with the bar of the "T" being a really nice Gasthaus. In the summer, go around to the back and eat on the terrace on the small lake.

They have some great food, as well as a nice Dunkel Weizen.