I used to go to Bischoff's with my dad when I was a kid 30 years ago and it is every bit as amazing as it was then (the same guy is working there, too). If you get a sundae, be prepared to share, they're huge. Great chocolate too.
I totally disagree about the food being bad. They have great burgers, turkey salad, tuna, and other sandwiches. Their potato salad and cole slaw are also awesome. And the ice cream is some of the best I've ever had. Plus, they make their sodas the old fashioned way with the syrup and seltzer, and their candy is really good.