I'd dare say this is one of the better kept secrets in downtown Pittsburgh. As someone who's visited for lunch on several occasions, I find the prices reasonable, the staff attentive and friendly, and the food terrific!
I highly suggest the Chicken Romano. You can get a decent portion with salad, veggies/pasta, and delicious bread for about $10.
The atmosphere is a little dark, but it takes me back to the little neighborhood haunt that emphasizes quality over ambience. That's a tradeoff I have no problem making.