My mother and father will be visiting this Christmas. Christmas Eve is my father's birthday. This year he'll be 75. In honor of his birthday and Christmas Eve, my husband I would like to take my parents to a nice dinner following Grace Cathedral services. We're looking for a place that is warm, cozy, not too noisy, and delicious in the Nob Hill/Union Square areas. We'd like a menu where main dishes cost no more than $30 or prix fixe no more than 60 pp. Any help is much appreciated!