I like Kelly's. It's even famous. There's a shot of Kelly's in the classic The Deer Hunter. Yes, this bar is that old.
The food is quite surprising for a bar and the macaroni and cheese is highly recommended. They actually bake their mac and cheese topped with bread crumbs.
The crowd is an interesting mix. I was there with a bunch of grad students, but it's not a college dominated place. The bar seems to have many regulars.