A 16th-century house near the Rathaus and Friedrichsbad and Caracalla baths goes the traditional route with cozy, wood-floored guest rooms that are as distinctive as the centuries-old surroundings. All are good-size, and some of the family-oriented suites are truly substantial; rooms on the upper floors have nice views of the rooftops of the old town, and so does a nice terrace at the top of the house.