They have just renovated and repainted the building. Looks more beautiful. It's always full during the weekend. I believe this is not only because of the Schwabische menu but also how the waitress treats the guest.
P.s: You can walk around the Pferderanch Merz, a ranch where you can see horses, ponies, chickens and if you're lucky ... people riding horses or kids riding ponnies (usually on Saturday, 2-5 pm). It lies only around 100 meters from this restaurant. You may buy bio eggs (10 for 2€) there.