I recently spent the weekend at Hyatt Olive 8 in Seattle. It was a great base for explorign the city and my room was really stylish. I loved the bright colors of the room and the king sized bed. The TV was huge with lots of channels plus an iPod dock. They charge extra for WiFi which is ridiculous when you're already paying this much for the room. I also wasn't a fan of the water-saving showerhead... the low water pressure probably made my shower take longer.
Definitely check out the fitness centre - it's amazing. Even if you dont work out, do take a dip in the pool. It's so relaxing and truly 5-star.