We travelled to Chicago from August 1st - 7th and stayed at the Hyatt Regency. We booked on Priceline, and got a great deal for the location and level of amenities available at the hotel. The bellman are incredibly helpful, as was the concierge. We were traveling with our 8 year old daughter, and it was very easy to get around with her.
My biggest complaint was the lack of wi-if in the room. You could get it, but you had to pay for it. This meant going to the lobby every time we wanted to check our e-mail or look up a restaurant review. Had I paid full price for this hotel, that would have really annoyed me.
Also, Lollapalooza was held the weekend we were there, and that created some challenges both in the city and the hotel. Saturday night was a little crazy in the hotel with some inappropriate behavior, but the hotel staff did a excellent job managing this. I'm not sure how to avoid this, other than to avoid traveling to the city during that festival.
We were in the West Tower,and had a view of Navy Pier, Lake Michigan and the Chicago River.More