First of all, I doubt that this is still available as it has been on Trulia for over 6 months. The rental market is hot so I find that hard to believe. Then again, maybe it is as there are multiple rooms available perhaps? This is just a hotel room or SRO. You don't even have your own bathroom!
Secondly, this is in the downtown/Tenderloin area--not the best neighborhood--but the price is good as I know studios nearby that rent for nearly $2000 a month.
Sorry, I'm not really sure how to advise you. Would I live there? No, I have pets and too much stuff. If I just needed a place to stay for a few weeks and this was all I could afford, then I would seriously consider it but you are going to be around some unsavory characters in my opinion.
Good luck with your search!