Nice
It is the second time I spend 1 night in Chicago. 
The room is very nice and good size, the bed is very confortable! The location is also nice - but if you're planning to use public transportations you should prefer something closer to Millenium Park! And that's it! 
The music in the lobby is so loud that you think you are in a boite! Doesn't look like a family friendly hotel... but for people that want to enjoy the night. There's many people (that doesn't look like only guests) drinking in the bar and talking aloud! Too noisy place.
It was our anniversary so I asked if they could give us a lake view room (I sent an e-mail feel days before) but when we arrived they said it was not available and gave us a terrible city view (just looking at one really close building - if at least it was a nice city view...). When we asked if it would be possible a late check out they said it would be +U$100 for +1 hour. 
Last time we stayed at Hyatt Regency that's an older hotel and maybe the bedroom is not as nice but... it was much better experience since they answered our requests and even gave us a nice welcome treat and card.