Disappointed - far below my expectation.
I booked a 2 bed room for a friend and I. This was my first ever trip to the States so I thought I'd book a decent hotel. Based on Tripadvisor reviews, I decided to pay the premium and book a room at the Allerton. 
The disappointment started at check-in. The space on the 2nd floor that doubles as the reception area is too small for a skyscraper hotel to cope with the volume of people checking-in. We had to try and push through people and excess furniture to get to the check-in desk. Seems the staff had had a hard day as they were quite rude. No warm welcome being offered here. Curt responses and very uninterested. 
All though the room was well appointed, it was one of the smallest rooms I've ever stayed in. Add to that, that it was sold as a 2 x double bed room, the theme (set in the check-in area) of furniture stuffed into a way too small space was continued...
The location is great being on the Magnificent Mile.
During our stay both our keycards stopped working. When I went down to get it sorted, I again ran into a wall of disgusting attitude. No apology for the inconvenience, no smile not even a good day. I was only told (very curtly) to not keep it next to my phone (might be a good suggestion when you check-in) but when I pointed out that I didnt carry a phone with me as I was on holiday.... I was again left waiting for an apology that would never pass her lips. 
Also, one friendly reminder. Check your bill at the Allerton. Bill padding! We logged on to the internet ONCE but was charged 2 connections. The reception clerk tried to fight that we had 2 devices connected but when I pointed out that the timing on the bill was exactly the same, he finally conceded that it would be a strange co-incidence and therefore agreed to reverse one of the charges. Again no apology. 
I would recommend the Holiday Inn. Its only a few block off of the Magnificent Mile so the location is near perfect and its alot cheaper than the joke that is the Allerton.