I booked a room here through hyatt 2 months prior to my convention in Denver.
I am a smoker so I booked a smoking room, for Tuesday - Sunday. Upon my arrival, I was greeted warmly by the valet and doorman. I proceeded to the check-in desk, and was told that they DID NOT have a smoking room available. I told them I had specifically booked that type of room more than 2 months prior, but the front desk clerk continued to shake his head saying that it was only a request, not a guarantee. Upon further review of their web site, you can see that it plainly asks, what is your preference. This is not the first time this has happened to me with Hyatt, but I will NOT be booking a room with Hyatt, until they change their attitudes with regard to smoking rooms.
Additionally, I told them at the time of check-in I would not be staying through Sunday, that my plans had changed and I would be leaving a day early. They said no problem, however when i went to check out they said, "Aren't you checking out early? I said, "No I told you when I checked in I would be checking out a day early." The clerk assured me it was no problem, however my credit card was billed for the additional night. I am still trying to get that resolved.
Another issue, I returned to my room late the first night I arrived to a horrible sewer smell. I called down to have someone come up and smell this and was told it was a problem on the lower floors sometimes. At that point, I must say that the Night Manager finally stepped up to the plate and gave me a Smoking Room. Of course, I still don't understand why I wasn't given that in the first place. It would have been alot less stressful and hectic.
As far as the hotel goes, it was very clean and very nice. (Other than the 7th floor sewer problem) The staff was great with the exception of a few desk people.The location is good. There are other choices in the area and I just think putting travelers through so much hassle unnecessarily is something I would rather do without. What these hotels fail to realize is we have already gotten up early, gone through the hassle of flying, airport security, baggage, rental cars, going on work appointments and regular business hoping to just get to our hotel and rekax.When they don't live up to our expectations we don't forget about that. The Denver Grand Hyatt treats smokers like second class citizens, and I will stick to my preferred choice when traveling, The Hilton family of hotels.

We stayed at the Grand Hyatt in Denver for two days in June and it was fabulous. The service was great, the room was beautiful. We had a lovely view of the mountains. The hotel is close to the 16th street mall. Denver is a wonderful city and the Grand is a perfect place to stay whether on business or pleasure.

Great choice for a hotel in downtown Denver. The location is really good as previously stated in other reviews. The staff was friendly. We stayed in a Corner room and the room was a good size but the bathroom a bit small. Parking, valet or otherwise, is expensive but most places in downtown are. Overall this is a good choice and we would stay here again.

After doing quite a bit of research on downtown Denver hotels, I finally decided to stay at the Grand Hyatt after seeing many favorable reviews here and elsewhere. I couldn't have been happier. Rooms were clean and large and the beds were extremely comfortable. The staff - everyone from the valet and bellhop to the bartender in the Fireside Lounge and the front desk clerks - couldn't have been nicer. I was pleaseantly surprised by the dining room and the quality of the food, which was far better than at most hotels. The bar in the dining room area, however, is really small and has no atmosphere. But the Fireside Lounge is a lovely area with soft, cushy sofas and I have to agree with the other poster that the pianist in the lounge is excellent. Plus he plays your requests. Nothing better than sipping a martini and listening to a fab pianist playing Dean Martin and Sinatra. Loved the great downtown location, which is close to several attractions, shops, bars, and restaurants.