Its a W ...but Beware
I have stayed here several times. This is a standard W - The decor, amenities etc.....the service is OK. The style is a liitle more subdued than other W's, which is a good thing, and as a result seems modern with out being stupid "hip" - in other word there is a door on the bathroom and a chair that looks like a chair - LOL.
In general some of the newer W's seem to be trying to be a liitle too cool at the expense of being a functional hotel. 
Seattle is a town where you need a car (if on business for sure) but the valet is a little confused. The room service is good and I have eaten both breakfact and dinner in the restaurant. The food is good/ok and the service is as expected for the price point.
BIG WARNING ABOUT THIS HOTEL. All of the sports teams and/athletes seem to stay here as it is near the stadiums. Each time I have stayed (why I don't stay here anymore) there has been a party in the hall, a fight, hookers in the hall that lead to police and security - really loud and a scene. Not the hotels fault and they did handle it but it is not a pleasant experience trying to get into your $350 a nght room through someone being arrested.....