The following Trulia link has SIX sites that provide search capability to answer this question. One actually maps incidents based on a selected address: http://www.trulia.com/voices/Quality_of_Life/How_safe_is_San
While Police Departments are the source of all statistics, sometimes the presentation of their information is difficult to review.
I also agree with Rocky - take a friend and checkout the Neighborhood in the morning, afternoon and evening!
I hope this helps.
Rocky G.H. Hawrysz
Prudential California Realty