You can check out http://www.crimereports.com for research on what types of crimes have been committed and where. You can also check out http://www.meganslaw.ca.gov specifically to find out where sex offenders are staying. This is not something that a broker is able to give advice on.
That's a great question, but only you can make that determination because it is all relative to your experiences. If data might help you decide, you can go to http://www.sacpd.org/crime/mapping/ where you can see the amount and type of crimes that have been reported.
If you have other questions, feel free to contact me.