Great hostel, friendly staff, conveniently located. Free breakfast is mostly a range of bagels, bread, and spreads, but still highly welcome when you're in one of the world's most expensivecities.
2) The owner (P.J.) is the closest embodiment of John Cleese in Faulty Towers ever so make friends with him...or even better, become his Manuel! Si, si.
The wifi can be slow at the hostel, so go to Sugar Cafe on Sutter Street for fast free wifi and very good coffee. It's open from 8am until 2am every day!
Avoid. I reserved a room at the Adelaide. Once I got there, they told me they moved me to another hostel. The rooms look nothing like the Adelaide pictures & the building itself is a dump.