I visited Chicago with two of my girlfriends few weeks ago for a "shopping spree getaway weekend" on the famous Chicago Magnificent Mile. We rented the 3 bedroom duplex at the Walton Residence and it was one of the best accommodations we ever had while traveling to Chicago.
The hotel is located on Walton, right at the corner of Walton and Magnificent Mile, so it was walking distance from all our favorite shops as well as to the Oak beach! I only wished it was summer, we would have loved to spend few hours laying on this famous Chicago beach (I guess we will have to go back soon!).
The hotel is more than you can expect from a 5 star hotel. Beautifully designed, they pay attention to every detail: high French doors, large and comfortable beds, high quality sheets, very unique lamps (you can even buy if you like them). But one of the highlights is the kitchen, with all the tools and equipment you would expect to have only at home. It is fully equipped, with everything from glasses, silverware, pots as well as espresso machine. Also, they have an office area, where you can plug in your laptop to a high speed free wireless and also free local phone calls!! You cannot beat that. We did not take full advantage of the office setup since we were in Chicago for leisure, but if I were to ever come back for business, I think I found the right place for that! The dinning area is perfect for a business conference.
The staff was very nice and responsive to all of our needs. It is not your typical hotel, it has fewer rooms, I think around 25-30, and there is no spa yet (even though I think they are building one at the moment). But since you are in the middle of the Gold Coast, there are plenty of restaurants and spas in the area. There is also a very famous restaurant on the ground floor of the Walton Residence, called Pane Caldo, which I understand is not part of the hotel, but it serves divine Italian food. Highly recommended whether or not you stay at the Walton Residence.
I will definitely come back, they have a wide range of suite sizes, which can accommodate up to 6-7 guests per suite, so either you travel alone or with your entire family, this is the place to go!