Common Grounds has two locations, and while different, they're both great examples of an urban coffee house. The Highlands location (the original) is still funky and comfortable, with sometimes wacky art and a variety of local musicians, and the Downtown location is convenient, cool, and absolutely non-corporate (hear that, Starbucks?). I've always found the staff friendly at both shops, and they make great coffee. I've never found either place dirty, and if things are a little cluttered, its certainly because of the brisk business that Common Grounds does. You can't go wrong with Common Grounds.
Pros: Funky, unassuming atmosphere, no pressure to be cool and hip
Cons: Highlands location has somewhat limited seating