As a lifelong Newark resident, I can tell you North of Park Avenue from the park to Roseville Ave. Then north of Springdale Avenue to the East Orange Line.

If you're looking forward more of an urban feel with rowhouses and other "missing middle" Urban architecture, the 6th Avenue corridor in lower Roseville is pretty nice. But you have to be a little Street Smart. It's a transition area between the more Suburban upper Roseville and the inner city central Ward which usually begins at Orange Street and South.