The average rent in the state is at $473 per month. However, in Chicago, rent for a flat or one bedroom apartment can cost over $1000. Apartments in or around college towns also have higher rents as the demand for them is always great.
I would say that if you are interested in law school, you need to maintain a sense of professionalism at all times, including during the application process. That means that you need to be reliable, responsible and punctual from the moment you pick up that application.