Being a third year at UHS, I may offer some advice.
Regarding places to live...yeah, some people live in North KC, but I found it dull and lacking in neighborhoods. And, it was rather far from the typical watering holes and gathering places that we ended up (velvet dog, lava room, westport, plaza etc). I chose to live in Westport my first year and Brookside my second. Brookside was by far the better of the two, and was in a GREAT area just south of the plaza, near UMKC.
Regarding your core rotations: well, UHS changes policies like they change socks, so who knows what will be in store for you guys. From what I understand, the rotations in KC aren't the strongest regarding didactics and are lacking in hospital experience (alot of IM is done in clinics vs. hospitals). Plus MCI is not a true academic hospital, it has only a year of experience with handling students.
My advice would be to head out of town for years 3 and 4 to areas where students, interns, residents, and didactics are strong. I am in St. Louis, and I am trying to take advantage of the hospitals around here and working with St. Louis University students and seeing what there didactics are like is helpful.