Simple and comfortable, no frills, great location!
The Tremont hotel is a prime location to tour on foot around downtown- Steps away from shopping on michigan ave, restaurants on state st, a short cab ride (or a long walk) to millennium park, or the beach area. 
Upon arrival, we were greeted promptly by a friendly concierge who escorted us and our loads of luggage to our room. My encounters with the staff were all positive. They always held open the doors and had warm words of greeting or departure. 
The building is old, the elevator creaks, and the rooms are small. I personally like the old charm of chicago hotels, but don't expect any frills at the Tremont. The rooms are clean and fairly modern - cushy beds and flat screen tv. The bathrooms however need some updating. I like to take a hot bath and was deterred by the condition of the tub and tiles. 
If you can get a room at a decent price, then this hotel is good for a comfortable 1-3 night stay.