Check out Trulia's crime map as well for this area.
There are some trouble spots in my opinion in the Valley Oak area. Perhaps not in the immediate area of his home. Take a look at the crime activity.
All the Best,
This answer seems obvious to me and I just unfortunately moved here
As Realtors, we are not allowed to give our personal opinions on topics such as your question.
It is a very strict Code of Ethics violation if we do.
Please use the very helpful links that these fine agents/brokers have listed for you.