Let me just say that I don't see how you can possibly get more convenient than Streeterville and Mcclurg/Onterie as far as location.
Within a few blocks from Mclurg/Onterie are FOUR grocery stores, a Hollywood video, three food courts (just off the top of my head) along with countless restaurants and sandwich shops, Michigan Avenue, two multiplex movie theaters, a huge liquor store, two Walgreens, an Ace Hardware, a multi lane bowling alley, the Lakefront, two parks, countless gyms, countless banks, it just goes on and on. Plus by living in Streeterville you can wake up and be in class 10 minutes later. I seriously think you will regret not living in Streeterville, especially your first year. I don't mean to scare you, but it's just that Streeterville is CRAZY convenient, not just for school, but for life in general. Lincoln Park is a very nice area though and I'm sure you will be very happy there, but if it's not too late to back out of your decision to live in Lincoln Park, I would highly, HIGHLY recommend living in Streeterville as a Northwestern medical student. There are many great reasons to live in Lincoln Park over Streeterville, but convenience, for school and for life in general, is definetly not one of them.