This is mine and my husband's favorite hamburger place to eat in Karlsruhe. The staff is friendly, the food is great and the location is very nice, too. The burgers are not ginormous that you can't walk after eating, but it is a large portion so you won't be disappointed. We are not americans and we can't say if the diner stays true to the American tradition, but from what we've seen here in Germany, it can't get any better than this.
Pros: it's quiet in there if you seat in the attached sitting are or outside in the Summer, and the staff is great.
Cons: there isn't much room for parking in front of it and you might have to park in a nearby street. I'd stay away from their milkshakes, I found them to be a little "watered" down.
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