Pros: independently owned, friendly staff, the most delicioius coffee drinks in the Slope (beating Ozzie's, Gorilla Coffee, the Tea Lounge, and, of course, Starbucks), tasty pastries and chocolates, late-night hours. Cocoa Bar has one of the best outdoor spaces in Brooklyn, too. Free Wi-Fi is key for freelancers. The nighttime scene is great, as the 7th Avenue section of Park Slope is otherwise hurting for good places to hang out if all you want is a glass of wine. Pairing chocolate with wine is a great idea, and Cocoa Bar does it better than anyone.
Pros: Delicious coffee, especially their flavored lattes, frappes
Cons: Loud, repetitive music...maybe they want to drive you out of there fast?