It's a Hyatt and it's a place
My wife surprised me with a birthday weekend that including two nights at the Hyatt Place and an entry for our family in the annual St. Patrick's Day Dash 4K run that starts at Seattle Center. The Hyatt Place was a great location to walk to the Center and avoid the traffic and parking hassles in this busy, urban area.
The Hyatt Place lobby and public spaces are very attractive and inviting. The front desk staff were friendly and accommodating. There are no bell staff, however, to help with luggage. There are luggage carts parked near the front door that you can use to cart your own bags to your room. There only seem to be two, however, and they disappear quickly on check out mornings.
The hotel parking garage is pricey ($20 a day) and involves a complicated system of key cards and gates. But it beats paying to park near Seattle Center.
The room was very attractive and included a refrigerator but no microwave. There was no in room safe. We had one King Bed that is separated from the sitting area. There was one large, HD television with state of the art AV connections if you have a portable DVD player. The wireless Internet was free and fairly fast.
The bath room only had a shower. They only provided three towels for a family of four, so we had to stop at the front desk to ask for more. The shower also ran out of hot water with minutes the first night we were there. 
One of the reasons my wife selected the Hyatt was that it was one of the only ones in the downtown area that had a pool. The pool and exercise room are located on the main floor. The pool is fairly large, but shallow. It was three feet 10 inches at it's deepest end. It was also wasn't very warm although the front desk assured us that it was kept at 81 degrees. There is no hot tub/spa.
The Hyatt does offer a free breakfast with breakfast sandwiches, cereals, pancakes, waffles, fresh fruit and yogurt. Be warned that it is a free for all on weekends and seating space can be a premium. 
Although the Hyatt is located near the Seattle Center, the restaurant choices located within walking distance are pretty limited. Five of the six listed on their Web site are actually out of business. So plan on driving if you want to have dining choices.
Overall the Hyatt Place was a good value, but it has room for improvement.