Marina Motel is a great place to stay when in SF. Clean, fast check in, friendly people.
Just beware it might get very noisy if you happen to have a room at front street.
Deposit of 250$ is not mentioned in advance (just after booking) and I found it a bit too much, considering that hotels require 100$.
Other than that, you get eventually a garage that is nice to have in San Francisco.
Recommended overall.