I just have to disagree here. I learned to code in a Starbucks in New York City, totally immersed in my computer for hours on end every day for a summer, years ago. Today I work from them whenever I possibly can, even if this means Zipcar'ing it. I like the atmosphere of Starbucks, and in general I like being surrounded by activity. Coffee shop + headphones = my most productive; yes, doing good work.

Like melling said, this looks like it goes down under "there's no one right answer." You experience was obviously different. But it's definitely the place where I get in the zone the quickest, do the best work the fastest, and in general are the most happy.