Helvetia is a boutique hotel with a restaurant, bar and roof terrace of the same name. The latter can be rented on request (minimum consumption CHF 600 for 15 persons). New is the Pool Bar in 80's Miami look. Great signature drinks and crossover food with hot and cold dishes guaranteed. The restaurant is famous for its Swiss cuisine - for many it offers the best meatloaf.
My tip: After-work in the pool bar with cocktails, lobster roll, lukewarm oven carrot with grapefruit