Costa Viola Bar Lounge Ristoro is highly praised for its authentic Italian cuisine, with dishes such as linguine with mussels, clams, and calamaretti in a fresh tomato sauce being described as fantastic and generously portioned. Guests appreciate the fresh preparation and the atmosphere, which evokes a seaside Italian experience. The restaurant is noted for its friendly and efficient service, contributing to a welcoming and pleasant environment. While reviews are overwhelmingly positive, highlighting it as one of the best Italian dining experiences in Switzerland, no significant negative aspects were mentioned in the provided feedback.