Basic budget stay
I found Marina Inn on Tripadvisor, and despite some hesitation, I booked here because the location and price ultimately won out. Essentially, I found what was described by other reviewers to be, more or less, true: place is loud with the constant rumbling of Lombard Street; my sheet was stained; could hear the snorer in the room next door; and I did see a couple of ants in the bathroom. 
Nonetheless, I would still recommend to those who are on a budget. The location is tops (a morning run along in the nearby marina towards Golden Gate Bridge and Palace of Fine Arts was a highlight for me on this trip). The Victorian decor was sweet. Room was cleaned everyday. And though the room was small, the bathroom was relatively huge.
I was a solo traveler, and would recommend to other solo travelers who are okay with trading luxuries for a decent stay at a great price.