Centrally located in Badenweiler, within easy walking distance of the Cassiopeia baths, the Roman bath ruins, the Burg Baden castle, and many excellent restaurants and cafés. Hotel rooms are in the traditional European style, and breakfast is the customary European spread of breads, fruits, pastries, meats and cheeses. Staff were warm, welcoming and very friendly, and all spoke English. Parking is available behind the hotel, but spaces can be tight for anything larger than a compact/intermediate car. If you are going to the Cassiopeia baths, staff will give you a "spa bag" with towels, robe, slippers etc.
I didn't know what to expect from either Badenweiler or the Hotel zur Sonne, but I was very pleasantly surprised by both. Badenweiler is a gem of a town on the edge of the Black Forest, and the Hotel zur Sonne is an excellent place to stay, and a great value too.