This cafeteria isn't really a cafeteria in the traditional sense of the word. The place where students can get food is quartered off and set up with individual vendors. It isn't uncommon for chefs to come in just to serve the students.
If you're looking for a place to unwind, the mess hall is the best place to do it. This area is open to playing pool and other assorted games and has a large section devoted to couches and a projection style media center.
The southern sector of the school is known for being a place of relaxation. In this area of the Sanctuary you will find the cafeteria and a few other pleasant places that are a great break from all that learning.