I haven't stayed there, but I did a lot of investigating into the Ann Arbor hotel situation for my wedding last summer. We ended up sending people to the Ypsi Marriott. I just didn't think Campus Inn was worth it. There aren't many better options if your goal is to stay within walking distance of the med center though. The Bell Tower and Campus Inn are both owned by the same people and I liked CI better. It lacks free parking, but a less expensive option is the Michigan League. If you want to go further out, I think the Holiday Inn on North Campus has a free shuttle to the med center (a lot of patients stay there).