Besides finding out the crime statistics, a really good way to feel out a neighborhood is to go there and feel it out in person. Go there and walk around on a weekend and weekday - and evening. Ask the neighbors questions that are out, they usually love to talk. Go shopping there (there's a lot!) or visit a local restaurant.
You can also sign up for crime alerts on the City of San Diego Police Dept. website for a particular address too. That way you'll know what types of crimes have been committed in the a couple of different areas, and you can choose which types of crimes to be notified about.
Hope this helps!
Cory La Scala, REALTOR