Ask HN: What are the best Hacker Houses in SF?

A few I know of:<p>Rise: <a href="http://www.risesf.com/" rel="nofollow">http://www.risesf.com/</a><p>Chez JJ: <a href="http://chezjj.com/" rel="nofollow">http://chezjj.com/</a><p>The Glint: <a href="http://theglint.com/" rel="nofollow">http://theglint.com/</a><p>Rainbow Mansion: <a href="http://www.rainbowmansion.com/" rel="nofollow">http://www.rainbowmansion.com/</a>

What is a Hacker House?