Two star quality in a five star facility
Over the years, I have stayed in Hyatt hotels countless numbers of times. I have never in all those visits encountered so many unfavorable surprises at a Hyatt hotel as I did recently at this Chicago location. At $325 per night, the bed was a total disaster...I spent the first night tossing and turning due to the lack of back support, all the lumps and the loud squeaks. When I complained the next am to front desk, I was initially told that the whole hotel was furnished with "standard Hyatt beds" and there was little they could do to help me. After further discussions with the director of housekeeping, I was told that all mattresses are changed out on a yearly basis, but if someone before me was particularly "rough"on the mattress in my room, they could bring a new one up and exchange it. The new mattress was much better but still nowhere near the high comfort quality of the mattresses I find in lesser starrred chains such as Hampton Suites, Hilton Garden Inns, and Fairield Suites, 
Also of note, this is another hotel which has decided to "go green". Air conditioning automatically powers down to lower fan settings after running for a while. To get it restarted on high, we had to turn it off and on occassionally at the thermostat. The new toilets which they have installed do not flush with the industry standard 1.6 liter flushes for "greener models", but instead use on 1.3 liters per flush. This must save significant on the Hyatt's water useage and bill, but the toilets remain soiled after a flush and guests need to hand clean the toilet rim with toilet paper to avoid unsightly messes for the next user. The bathroom in our "Junior Suite" was so tiny only one person could possibly enter at a time, and it was equipped with a shower only and not a tub (even though the room descriptor did not mention this). The "suite" also had no separation between bed and the sitting area (which was two small couches and a desk at the foot of the bed.
Thed Hyatt employees were generally polite but it was interesting to see that no matter what number I called, the call always transferred first to the hotel operator and then i would have to wait several minutes for the front desk, housekeeping,concierge or valet to pick up on the call. I felt bad for the bellstand employee who took our luggage to the car. He had back problems and I had to lift the luggage into my car for him even though he was getting the tip.
There are many better choices for a fun weekend near the magnificent mile in Chicago.