Hyatt Regency O'Hare at 9300 West Bryn Mawr Avenue, Rosemont, Illinois.

Beautiful hotel with beautiful rooms and services. Gym is too busy in the morning and day times. But the good thing is that it is open for 24 hours. In room dining can be ordered only from Perks- supermarket and fast food, at the hotel lobby, which has a small variety of food and snacks selection. The bar in the lobby is very busy but nice. You can dine in hotel restaurant. Buffet breakfast was nice.
The staff is very friendly and helpful. Overall experience was very positive.