Under the law there are a number of topics that a real estate agent is not permitted to discuss.
The Philadelphia PD has an excellent interactive map that can help you ascertain crime stats for an area.
Ana Barlow, Coldwell Banker Preferred, Piladelphia
Here is a helpful link with crime statistics in Manayunk as well as some additional valuable information about the area:
If you are in the area, I suggest that you drive around the neighborhood and stop and talk to people you see to determine your comfort level there.
Good luck to you!
Prudential Connecticut Realty