Only one beer on tap. Sometimes it's nice not to have to make decisions. $1.35 or $2.00 for a tall -- how can you beat that? The sandwiches aren't as cheap, but they're large and tasty. Really good corned beef, although you'll inexplicably pay more for it (maybe that adds to the appeal).
The place feels cozy and friendly and you know as soon as you walk in off the street that this is a place you want to be. The service can also be a bit laid-back, but just go with it and enjoy yourself.