That rental/month sound very low
There is a name posted with that listing "Darrel Raynes" at (415) 694-0814
Did you call him first?
And...best way to find out if this is a scam is to drive by and see if there's a for sale sign. I didn't see one actively offered for sale at either street address
Saw one on Valita that is pending, subject to short sale approval
If you're looking to rent, best that you work with a property management company who specializes in renting properties in the area you want. This will at least minimize the risk of being scammed.