Good experience.
We booked the Allerton via Hotwire. We received a fantastic rate and the room was small, but probably very standard for Chicago. After two nights of sporadic sleep due to the elevator right outside our door, we asked to move to a different room. They were very accommodating and moved us to a room away from the elevator. And, it was even larger! 
The only "cons" to this hotel are the beds are just OK...for a 4 star hotel, they need pillow top mattresses. They have a feather mattress cover on top, but the feather poke you in the middle of the night. The elevators are horrendous!! You will wait for-ev-er for them. One employee told us a little trick---use the service elevator, even though it states you can't. 
Great location and excellent service.