There are a few internet sources of crime stats that you can search by zip code. I do not know how accuarte any of these sites are. For the most accurate information, contact the local police department.
Here are a few internet sites that you can check:
If you are on the other side of the highway in the Journal Sqaure area it would be more comparable to areas like Clinton Hill, Bushwick, Bed Stuy, and Crown Heights.
Overall, If you keep your eyes open and your head out of the clouds you will be fine like most major US cities.
I am currently moving out of Manhattan into a loft condo conversion in Van Vorst Park and I can't wait. I have a lot of friends in the neighborhood and we love it. Great cafe's and little stores.