Even better idea: work at a library. These are buildings designed to be quiet, meditative places, and they want you to be there all day. In addition, several libraries now allow coffee, and most have great Wifi.

Where do you find a library? If you are in the US, public libraries are a great downtown option. As a student at Stanford, I think great libraries are one of the biggest privileges. However, I think you don't need to be a Stanford student to get in! Like other universities, Stanford has a Federal Depository Service (http://en.wikipedia.org/wiki/Federal_Depository_Library_Prog...), which means the public has a right to enter and read federal publications at no cost (Strangely, I couldn't find a open-to-public library at Harvard though)

Hope this helps...