I changed my reservation to the Park Hyatt Chicago from the Renaissance (A Marriott hotel) after reading the rave reviews on Tripadvisor. I was not disappointed. The entire experience was unbelievable. While it was pricey, it was worth every penny for the room and service. If you want spacious, well-kept, luxurious accomodations with impeccable service you will find it here. The location, right on the Magnificent Mile also makes this the ideal choice for staying in Chicago. I walked to the Loop (Art Institute, Oriental Theatre, Millenium Park, etc.) everyday and of course, you are close to all of the best shopping.
When I arrived, the bellhop greeted me, took my luggage, and escorted me to the front desk. He then took my bag upstairs and gave me a tour of my room, explaining all of the features and complimentary items. I was speechless from this kind of service! They even greeted me by name when I returned to the hotel that evening.
The Park King Room looked just as amazing as it did in the hotel website photos (really!). It was a posh 550 square feet of contemporary asian design. The room overlooked Water Tower place-get one of these rooms if you can. Half of the room was the bathroom which included a glass inclosed walk-in shower, WC, sink, and luxurious soaking tub with complimentary bath salts and candles. I took two baths while there and it was soooo relaxing. It was the little touches like that that made this hotel special. There was even a lint brush in the closet and complimentary bottles of spring water and apples!
If your worried about sleep, don't be. The bed was so comfortable I hardly used the two chairs in the room. There is a fire station down the street and the sirens woke me up a few times the first night. After that I got used to it (you have to in a big city) and it did not bother me. No slamming doors or noisy guests on my floor and can't imagine that there would ever be at this hotel.
I had breakfast each morning in NoMi and the service was impeccable. They knew just when to refill your cup of coffee or leave you be. I felt like a could linger as long as I liked, and read my complimentary New York Times while overlooking the Water Tower. I also ordered room service two of the nights I was there. Usually room service is acceptable, but not here. It was amazing! My meals arrived within 30 mintues both nights and the staff was so personable. The food, from NoMi was quite good.- Try the fries with spicy mayonnaise, the tomato panzanella salad, the raspberry macaroon with ice cream and the refined tea list. There was a mix-up with room service one of the nights, but the prompt apology and correction of the mistake by the staff made me love this place even more!
The swimming pool was one of the hotels best features. Finally-a LAP pool for adults! I get sick of pools full of children, but except for one night, the pool was kid free. The three, 25-yd lanes were perfect for getting a swimming workout. The changing rooms were definitely the nicest I have ever seen. Showers with complimentary amenities, lockers, robes/slippers, steam room, etc. really made the place nice. The whirlpool and fitness room were also gorgeous and the large windows overlooking the city opened up the place. Even though I didn't use the fitness room, I can say that the complimentary fruit-flavored ice water was refreshing!
Housekeeping was prompt and made sure everything looked wonderful before I returned for the day. You actually get TWO housekeeping calls a day and one of them is REAL turndown service (shades down, music turned on, covers folded over, etc). If I haven't said enough about the staff, the parking valets were gracious and overly helpful.
I would give this hotel five stars if it were up to me!

We decided to splash out on the Hyatt based on TA reviews.
Booked on hotel website in advance and only by chance on checking days before arrival saw the name of our room type had changed & it was $115 dollars per night (inc tax) cheaper. Rang and got it changed easily, but reckon others got cheated.
On unpacking we discovered the stereo didn't work, the bathroom door handle was falling off with screws sticking out and the toilet did not flush properly. moved us to another room but had no bath, so had to move again! Very helpful doorman Joe, but 5 star,no.
Sat in busy bar first night and were pretty much ignored by staff.
However asst manager did come and find us to apologise for room problems, a bottle of wine was sent to our room gratis.
We had dinner at Nomi, food was average, cold for some portions, waiter was polite but absolutely no finesse, could have been working in a caff. And the maitred' looked down his nose at us,arms folded and spoke totally disinterestedly to us. We had an exquisite meal with great service at Spiaggia ,italian restaurant.
One day got back from breakfast to find room cleaning in full swing, (we were not checking out)
The good news; we have a sense of humour. The beds are the most amazingly comfortable we'd slept in, sheets exquisite.
The bath tub enormous and relaxing. The view onto the water with a window seat fabulous. The location perfect. Breakfast was fantastic, good choice, great view, attentive and pleasant staff, leisurely and quiet, exceeded our expectations.
On check out ,asst manager knocked a bar bill off to acknowledge our bad start a gesture we appreciated but truthfully would rather have got the service we had so looked forward to.
Would we stay there again? Probably!

The Park Hyatt is fantastic for anyone looking to relax and experience what Chicago has to offer for upscale travelers. It’s right on Michigan, central to shopping as well as dining on Rush Street.

The hotel is very chic and modern, with a small lobby and very quiet guest areas. The rooms are fantastic, with unobstructed views of Lake Michigan and extremely comfortable beds. Bathroom has great view as well, with huge tub and great glass shower.

NoMI is a must- on the 7th level with a wonderful outdoor patio as well as a formal dining room that leans out over Water Tower Place. Sunday brunch buffet is worth it.

Hotel has limited business amenities, as well as Spa services; I would recommend it primarily for leisure travelers who are looking to spend most of their time enjoying Chicago.

Excellent! The pizza we ordered through room service was good but we were not used to the Chicago style. We were thankful we were able to get a room here after a long day.