As agents, we are prohibited from taking a position as to whether something is a good neighborhood or bad. This is called redlining, and we just can't do it.
There are great folks in all neighborhoods. Some areas are more prone to crime. The good folks in all neighborhoods are working to make them better. The VERY BEST way to approach this research is to start with the crime stats on the city website, then do the following:
1) call the police department and ask for the name of the policeman who acts as the beat captain for that address. Ask to be contacted by this person, and have a full conversation about the neighborhood. Ask what are the known problems, has it been getting worse or better, is the neighborhood organized for crime watch and emergency preparedness. Has there been a history at that particular address?
2) Ask the beat captain for the name and contact number of the crime watch and emergency prep group and call them.
3) Take the time to knock on a few doors on the block, and talk to the actual neighbors. Their experiences and the sense of connection you feel with your neighborhood is going to make all the difference. Remember, an organized neighborhood is a safer neighborhood.