One of the most unique places in Pittsburgh has got to be Kelly's. When you walk in, you could virtually be going back in time to the 50s with the bar along the wall, high-backed booths and odd but soothing pink lighting. There's definitely an eclectic crowd that frequents Kelly's, I guess you can call it hipster, but that adds to the uniqueness of the bar. You never know what kind of people you'll run into there.
I haven't ever eaten there, but the drinks are fairly priced, especially their $4 mixed drink specials. I've never felt cheated on the amount of libations in their Gin Buck or Mojito.
When the bar area gets too crowded, you can also go to the back patio and order drinks from the waitresses on staff, who are usually pretty good.
It's a good bar with a different vibe worth checking out.