This is absolutely one of the best restaurants in Pittsburgh. Their food is exceptional and their drinks are very good.
They don't take reservations and it's kind of small inside. It can also tend to be loud in the same way that a lot of newer restaurants are that embrace the reclaimed aesthetic.
I wouldn't take a large party here but 4-5 would be perfect - just prepare for a wait.
You must get the burnt ends and a donut, if you're there for brunch.
Can't say enough good things about this place. Please go!