The short is..I think this is the best coffee shop in Pittsburgh.
The long is..
Service: They literally go out of their way to make sure you feel like a customer and not a number. I can honestly say that every time I have ever been there (In the double digits) they have always been pleasant.
Coffee: The coffee there is terrific. I'd say it's a bit strong which probably explains why it can really keep you up even when you would rather not be. It's a perculation station with a punch!
Food: The food there, however not the biggest list I've see has really great underrated sandwiches. If you are hungry, don't count this place out.
Hours: The best part of the whole sha bang is the hours. One of the latest coffee shops I know of. It's very convenient for the night owl. Open till 9pm on weekdays.
Atmosphere: Really interesting industrial feel with a slice of warmth from the great music that always seems to surprise me.
You will notice when you go in, freelancers flock here. Perhaps it's all the things I mentioned that motivates them to migrate there, not sure.
Pro Tip- Get your coffee there as oppose to go, they make a great cappuccino that just looks and tastes delicious.