When looking for apartments near NCSU you would be driving along the triangle formed by Western Blvd, Avent Ferry, and Gorman in Southwest Raleigh. The triangle (not to confuse with big Raleigh, Durham Triangle) is close to Centennial Campus for engineering students.
Within the triangle you will find the more basic apartments around NCSU. Most apartments are around 30 years old and are dominated by NCSU students, but not 100%. One of the key benefits to this area is the NCSU Wolfline which means you do not need to buy parking and will have a longer walk to class. The lack of the Wolfline is the only drawback of the multiple apartment communities around Lake Johnson.
While the triangle is where most places are, across the street from Main Campus a few large complexes have been built recently.
A little further from NCSU you will find the newer apartments that focus primarily on students. One of these areas is by Trailwood and Tryon. To overcome the issue with no Wolfline access many of the communities here have shuttles that run to Main and Centennial Campus and will drop you off near class.
NC State is a great school in Raleigh NC with 35,000 students (10k grad, 25k undergrad).