These elegantly low-key, painting-hung rooms in the center of town suggest the parlors of a refined German home, but the menu at one of Baden-Baden’s best and most popular old mainstays sticks to some homey classics like fried goose slices with red cabbage and dumplings and veal kidneys in a mustard sauce with potato puree. The surroundings are especially tranquil in the summer, when the dining room expands to a flowery terrace.