We stayed at the Hyatt Sunset Harbor in October and found the rooms to be clean and comfortable. This is an older property in need of some updating, but nothing major. The location could not have been better unless it was right on Duval street.
We found the staff to be very helpful and friendly. They let us check in early and let us leave our luggage at the front desk after checking out.

The problems we had were the cruise boats blocked the sunset/water views. The first morning we were there we were hoping to sit on the deck (2nd story), have coffee and enjoy the water views, no such luck with the cruise boat. Also having to take a taxi from the airport was a pain. When you are paying that much for a room or are a Hyatt timeshare owner, a free shuttle should be provided. They don't mind shuttling people around the island to see their timeshare property.
Last complaint is I think we were the youngest people staying at this place (early 30s). Most seemed to be 55 and up.

We would would prefer to stay at one of the other Hyatt properties in Key West, but would consider staying here again, after checking the cruise boat schedule.

Hotel staff not so nice to resort time share owners. Management very nasty.

I recently spent one night at this hotel. I was extremely impressed with how friendly the ladies who worked at the front desk were. The room was clean and comfortable. The location was very good - just a few minutes away from the shops, restaurants, bars, and museums.

We own a Hyatt timeshare in Sedona, Az which is beautiful. We trade one of our weeks each year for Sunset Harbor because we love Key West and this property is centrally located to everything fun in Key West. Don't expect a *****Hyatt resort here. The property is something like 15 years old but is well maintained. They're going to remodel the living rooms in all the units this year. The staff are "on it" and I have no complaints. The manager is tuned into her property and sees that everything is perfect. If you stay at this property you won't need a car as you are within walking distance to everything that is Key West.
Staff: Excellent. Went out of their way to make our stay the best it could be.
Rooms: need a little upgrading but that's happening. Beds were very comfortable and rooms were QUIET.
Pool: no complaints
Grounds: Beautiful and well maintained
Concierge: knowledgable and made some fine recommendations for dining and entertainment
WiFi: not bad. I went a day and a half without service but it was fixed.
We will be back here next year.