It's the little trianglar sliver bounded by S 9th street, E Passyunk Ave, and Wharton St. Sylvester Stallone has a scene here in the original Rocky. Cheese steak paradise.
http://maps.google.com/maps?q=1219+S+9th+St,+Philadelphia,+PA+19147+(Geno's+Steaks)&spn=0.004978,0.008623&t=k&hl=en