There's a cafe near me in Brooklyn that has a nice interior space and free wifi. It's always packed and everyone brings a laptop. Coffee prices are normal if not a bit low for high-end coffee (their coffee is really good). They serve snacks, but not much else. I have no idea how they turn a profit with all the people lounging for hours with a little espresso or cup of tea. There's a morning rush, but it's really small compared to places nearer the subway.