As a realtor I am strictly forbidden to cast judgements about what is considered "safe" or "unsafe" since it can be somewhat subjective, but I would encourage you to check out websites the give you crime stats like:
You can also call the Berkeley police department directly via phone and ask about crime in specific neighborhoods.
Good luck in your search and let me know if you have any other questions!
Better Homes and Gardens | Mason-McDuffie Real Estate
2095 Rose Street, Suite 100
Berkeley, CA 94709
DRE # 01902004... more