Poor customer service, very small rooms, terrible stay but great conference services
The only reason this is not a terrible rating is because the conference services were extraordinary. However the hotel part of the stay was below terrible. I could only think of three positive things about the hotel but they were outweighed by the awful experience.
Excellent location
Exquisitely appointed- the decorations are excellent with great attention to detail. 
The staff that took care of the conference I was attending were perhaps the best I've seen.
Cons:
Customer service was terrible. I checked in and no one could find the vouchers for breakfast. They said they would deliver them to my room but they did not. They didn't want to give me the wireless code even though I new I was entitled to it (and i was right so I got it eventually). The two women seemed less than enthusiastic about checking me in. they kept answering the phone and it really seemed as if I was burdening them to be there. The next morning I woke up with BITES DOWN MY BACK. Yes bites. I don't know what they were and I won't make unproven accusations but I have NEVER had bites like this and in the quantity that I had. I called the front desk. i was very polite and was clear that I didn't know what they are but faced with the facts, I had to assume some kind of insect(s) were in the bed at one point. They answered by telling me that they would change my room if that is what I wanted. I did. My room was VERY small, most in the hotel are. but it was a double bed, not a queen, and there were only 2 feet on either side of the bed. The mattresses are thin and they put some feather-bed pads on top to compensate. The elevators are incredibly slow and small. The reason that is relevant here is because there are often lines of people waiting for the elevator and because everything in this hotel is cramped and tiny I had seen many people leaning on the doors of the rooms across from the elevators. They moved me to one of these rooms. I called back down and requested a room not across from the elevator and got the distinct feeling that they thought I had told them about the bites I received in the hotel to get a bigger room (not the case). I was moved to a similar room. But the lady that delivered the key to me was borderline rude and utterly unprofessional. She had a hard candy in her hand that she had taken out of her mouth and was holding. She handed me the keys with the hand that was holding the wet hard candy that she had just removed from her mouth. Really? That is very unprofessional. You can read other reviews to get a sense of just how small the rooms are and how slow the elevators are. Additionally, the tvs are pretty old. They come on at a blaring volume level (this happened in both rooms I stayed in). And the Tv in the second room kept on randomly turning on. 
There are so many hotels in Chicago, i will never stay at this one again. It is too bad the Tip Tap Top ball room is exquisite and the conference facilities were great but why stay in tiny outdated rooms with loud plumbing and unbelievably slow elevators when you could stay in so many other hotels. 
When I checked out the man asked me how i enjoyed my stay. I calmly but honestly told him. He was the only person I spoke to that showed any empathy at all. I had to stay there for 4 nights and sleep in a hotel where I knew something had bitten me repeatedly in my sleep. If they had treated me even remotely cordially during the process I would not have written this review.