Hookah Bookah is one of the more popular hookah spots in Pgh. The crowd can be a little collegey but I wouldn't say that it's unfriendly to those past the college scene.
It's a clean, well-maintained space. They have screens placed through the place, sometimes with sports or arabic music videos playing. During the summer, they also offer outdoor seating, which is nice and relaxing.
The staff are competent but the service can be rather slow at times. The prices are pretty expensif (usually $12-$15 per pipe) but the flavors are good and the hookahs 'hit' pretty well.
Still, as compared to the outrageously bad service at Sphinx, I would still rather choose Hookah Bookah.