We stayed here as a family whilst one of the adults was attending a large conference in November 2012. I don't think I saw any other children in the hotel for the four days we stayed, but we were never made to feel unwelcome.
The hotel was what you'd expect from any of this class: comfy beds, fluffy bathrobes... And also over-priced in-room WiFi and nowhere to keep your leftover pizza because the fridge is full of minibar items and completely automated to charge you automatically when items are removed. These little "Nickle and dime" things really bother me given the amount being paid for the room in the first place.
My only other complaint was the temperature of the pool! The pool itself was too small to be used for lap swimming, but much too cold to be enjoyed for leisure swimming.
We loved the location, an easy walk, even for a pre-schooler, to public transport. The staff were all helpful and friendly. The food in the restaurant was amazing, and, again, even though ours were the only children there, they were welcomed.
Just on principle, next time we are in Chicago, we would probably look for a hotel with free WiFi, but we wouldn't mind staying here again.