The Flightpath Coffee House
The Flightpath Coffee House is a great place to get work done, read, or do your taxes. The staff is direct and efficient, not looking to distract from your purpose. In fact, they pride themselves on being "a home office away from home," and they definitely deliver with plenty of workspace and computer outlets.
No obnoxious music or decor can be found here, just a hodge podge of modern furniture collected in their two clean, well-lit rooms. They also have an outside patio to the side for enjoying your latte in the nicer Austin months.