Very nice... but starting to show it's age.
I stayed at the Peninsula for two days for a business meeting. The property is starting to show it's age. My room was clean and comfortable, but the furnishings were a bit worn and the desk needed to be replaced. There was also no in-room coffee, which is pretty standard at other 5-star properites where I've stayed. All in all, the Peninsula was a pleasant hotel experience and nothing was wrong, but I expected a little more. For the money, you'd be better off at either one of Chicago's other 5-star properties such as the Swissotel or Fairmont.