Cool spot with lots of startups. They try hard to make social activities so people can mingle and share ideas. Internet is a bit slow, but I'm sure everyone is taxing the service big time. They are also moving to the Mission near 16th street so make sure it's still here before checking it out.
I am a proud member of Hub SoMa. I often leave feeling energized after talking to its members, most of whom are not only making a profit, but are also doing some good in the world. I strongly recommend you check the Hub out, particularly if you are a social entrepreneur looking for a co-working space.