I stayed at the Hampton Inn in Lombard for my interview in early October. You can call (630) 916-9000 to get the Midwestern rate for $59/night. I had a great experience there. The staff were very professional and friendly, the breakfast bar is quite extensive, and it's really close to a big shopping mall to either kill time or get last minute interview attire. CCOM recommends other places on their "Midwestern University Travel Guide", but I felt that this was the best choice for me and actually is cheapest of the Midwestern rates.
You may want to contact the school about you parking on campus with your car. I don't know the procedure of getting a visitor's pass (there's a security gate you'll have to enter). I'm sure it's no big deal, but might as well be sure there won't be any problem before you get there!
Congratulations on your interview invitation! I had a great experience there! Good luck!
Lari