Use the link in the previous post. I would stay at the Heartland inn as it is close, let them know you are interviewing for a medical position (sometimes hotels give discounts to residents interviewing and not medical students but you can swing it both ways by being ambiguous). The Heartland is your run of the mill 1-2 star hotel with decent amenities (highspeed internet connections) and it has shuttles to the hospital/university. Also, it is very close to Bars and good restaurants. If you are coming from the eastern Iowa Airport (Cedar rapids) it is about 12 miles and they have a shuttle from the airport which was about $20 or $35 roundtrip. Sometimes you can convince the taxis to take you at the same rate. Be careful this time of year- it is BUTT COLD! Before you leave make sure you take a taxi just East of campus around the "old capitol" and check out the student life. It is an awesome array of trendy bars, restaurants, shops, and generally people just hanging out and having a good time. I dont know how the winter will affect the hanging out.
i stayed at the iowa house, which is right across the river. was a 5min walk to the med school campus.