Great Location, OK Experience
We stayed at The Allerton to attend a wedding. The wedding was absolutely beautiful and perfectly run, so five stars on that front. The location is perfect - you're right in the center of everything. I was very pleased about that. We paid only 50% of the typical room rate because Southwest was running a special and The Allerton happened to be included. So we pre-paid and that made things very easy. 
On the plus side, the rooms and bathroom were very clean and they seemed to have been updated fairly recently. The things we didn't like:
1. The elevators took FOREVER and they are VERY small.
2. The bed was very old and very uncomfortable. You could feel every spring in the mattress and when you got on the bed it was like you sunk in. That did not make for a good sleep.
3. The bathrooms had almost no counterspace. They were clean and beautiful, but ours had a pedestal sink and a very very small shelf above it, and that was it. It's pretty annoying to have to store your toiletries outside the bathroom on the floor.
All in all, I think I would stay at The Allerton again just purely because of the location. But there are small improvements they could easily make which would enhance the experience.