Kinda sketch, but I somewhat expect that from a hookah lounge.
Looking like it was decorated by a freshman who had access to a large amount of black-lights and bonded leather sectionals, Six Lounge has a comfortable, albeit "youthful," atmosphere for smoking shisha. They have a large selection of flavors to choose from, and tend to be attentive in adding coals. They additionally have a small selection of drinks to choose from, but no external drinks may be brought in. If you like smoking shisha enough, they even sell pipes and tobacco for you take home.
While not my favorite place in town, it is opened late to appease the bar crowds. Since many people  don't stay out too late on weekdays, this makes Six Lounge a decent place to study at night.