We stayed at the hotel for a night as we were travelling from our home to a holiday in southern Germany. The hotel is in a quirky old building and the rooms are comfortable and well equipped for a short stay. There is no reception and I am not sure how you would book a room if you were just passing. We had found the hotel on the web and pre-booked (the website is basic, but one I made contact the communication was good). Breakfast was very good with a huge range of choice in a large, bright room.
Bad Wimpfen is a great unspoilt medieval town with loads of character and plenty of places to eat.