@Angelo MartBit of a strong generalization. Newark is pretty stratified between neighborhoods and recommending that someone go to the worst neighborhood and rent it to Section 8 as their first multi family is dangerous. I would agree that flipping in Newark is a bad choice just because the housing stock is so old and most have not had steady upkeep for 50+ years.
I'd just like to add to what others have said about the North Ward and the Ironbound (Down Neck if your talking to old Italians) is that even in those districts there are multiple neighborhoods. In the Ironbound there is the East Ferry, Riverside, North Ironbound, and South Ironbound. And even in the North Ironbound there are areas with low rise projects and lower income tenant base and areas with a high income white collar tenant base. If you take your time and drive around the area you will see these differences and they will be reflected in prices :)