Not worth it
I was just in Seattle for a business trip, 6 nights at the W. I am originally from Seattle and knew that the W is in a good location so was excited to finally stay there, as I couldn't justify the expense when I lived in Seattle. I was disappointed. Not from a hotel stand point, the hotel is nice, location is excellent, and the toiletries (sp) are especially good. 
The not so good in my opinion: The parking is ridiculous. I just submitted my expense report. Parking is advertised at $37, but after taxes it came to $45.15 a day. I know its the city but really I don't see how that is justified. Every morning as I went to get my car I had about 3 employees ask me if I was checking out. I'd rather hear, good morning, have a good day, not, are you checking out. It sort of makes you feel like they can't wait for you to leave. When I checked in I was in a lower level and I asked to be moved up with a city view. The front desk lady was very nice and said ofcourse and just told me to bring my luggage down the next morning and they would give me a higher level room with a better view. That was a laugh. I was given a room directly across the hall from the previous room I was in. I was dumbstruck so I just forgot about it as I realized it wasn't worth the hassle. I even pre-requested a higher room as my husband was meeting me there and it was his first time in Seattle...clearly that didn't do anything.
The last thing that really set me off was that on the last night we were there, which was a Saturday night, our neighbors in the next room were partying it up something fierce. I am not old, I partied, still party, but it was obnoxious. We tried to let it go, finally gave them a door knock to be quiet...but they were not getting any quieter. We called the front desk who apparently sent in security. They were quiet for about an hour when at 2 am, they decided to go for round 2. All in all, we were woke up by then 3 times that night. We called the front desk twice, mind you, we tried really hard not to complain as we know we've all been there, but they were over the top. When I checked out the next morning the lady asked me how my visit was and I said overall it was good except for last night. She said, "oh I heard"...that was it. No offer of anything or apology, nothing. 
I think this hotel is ok. I will never stay here again based on the parking rip off alone, I'd rather stay elsewhere where I at least have the option of the self park for less than the $45/day. Last time I stayed at the Westin I paid $12/ night for self park, much more reasonable.