Been here three times now when in town for work. The Commoner burger is good. Had the pear and arugula salad last time. Excellent but you'll need more for dinner. Someone else in our party had the Commoner salad, which was much larger and about the same price. Curious. Beers are always good here, with a variety of pale ales and ipas.
A half level underground with an industrial decor, very nice with great lighting. Great place for groups at the high tables and tall cafeteria style long tables. Acoustics are too lively; you end up leaning over and yelling to the person across the table when it gets full.
Its becoming our go-to when we're in town; although it's not cheap and I keep thinking you can get the same for less Philly. Location is right downtown and close to the hotels, which could explain the price.