First Time in PHilly

Hello,

This is my first trip to Philly (work related)  I'm flying in tonight from Boston.  I was looking through some ads and notice a lot of "regions" like center city, chery hill, etc.

If I'm staying in a downtown area about 8 miles from airport is that considered center city or downtown?

I don't have a car so looking for easy walk for incall or local outcall.

Thanks so much!