LAPD has a crime map website - http://www.lapdcrimemaps.org. You just type in your address and choose a radius from 1 to 5 miles and it will show crimes committed for up to the last 7 days. Typically in our area we see more thefts, car thefts and a few burglaries rather than very violent crimes.
If you would like a detailed neighborhood report which includes the crime rate % for Sherman Oaks please contact me with your email address and I will prepare and send one to you.
Kind regards. Joanna
Keep in mind that opinions are often subjective--If you are concerned about crime, your best source of information is the local police department, why not consider calling/visiting, ask all your questions and hear all there is to hear firsthand--they'll gladly help.