Workshop Cafe is one of my favorite places to work in SF. You don't feel like a cafe squatter since you pay for your seat, and its always nice working around like-minded individuals. Plus there are so many outlets... http://workshopcafe.com/
But it's totally awesome to have the capability to check out who's there. I hope it goes a long way toward fostering a community there and helping people make useful contacts.
You can currently use the app on your desktop browser using the same url (https://app.workshopcafe.com) and get the same feature set as you get on your phone (Except for things that require a phone like calling or texting in orders). No need to switch from your laptop!