Nice hotel and location
We were happy with our stay at the Blackstone. The rooms were nice and the location was a little down from the Magnificent Mile, but not too far.
We had breakfast in Mercat and it was DELICIOUS. My husband and I shared the Brioche French Toast and the Hangar Steak and Eggs and both were very, very good. We both really enjoyed the breakfast and the french toast is the best I have ever eaten. Cudos to the Chef.
Two things I will mention.....first, do not go to Chicago in the summer. It was 103 degrees (114 with the heat index) and it was just too hot to enjoy the trip. Second, the concierge lounge had a good breakfast, but happy hour was just cheese and crackers and that's it. C'mon Marriott take care of your frequent guests.