My husband and I will be in Boston for a few days in September. We are native San Franciscans who enjoy fresh, seasonal ingredients, cleanly cooked and are also wine lovers. We are staying at The Hyatt but, of course, will taxi for good chow! I will check my food magazines but would appreciate a chowhound's reccommendation. One person here has raved about Mistral. All I heard was it's expensive. Is it worth a meal? Thanks.