Long walks, huge room, grotty bathroom, noisy housekeeping...
Overall I thought this hotel was a disappointment due to the quality of the bathroom and the noise from the other guests and housekeeping. The extra charges can add up quickly too...
Check in was quick and the public areas of the hotel offer a good first impression. There is a bar and restaurant in the main lobby. Rooms look over a courtyard or the pool area - its a strange layout as there are also some rooms (starting at the 11s) which are opposite the ground floor conference rooms and are along the corridor to the pool, car park and conference centre - these must be very noisy so would try to avoid these
Our room was 2209 - a double king - which was apparently an upgrade, It was huge with acres of space. Which made the fact that it had TINY bathroom really odd. The bathroom ceiling was 6 inches lower that the rest of the room and it didn't have a proper door - it was a sliding opaque glass door which didn't cover the door frame and offered little privacy. The WC was set at an angle, there was hardly any vanity top area and the bottom of the bath tub needed a good scrub - as did the mould around the shower. Yuk. The shower was so low on the wall I had to crouch down to wash my hair - my OH at 6ft found it harder to manage. Simply not good enough for a Hilton...
As is usual with hotels which have long corridors - people walk down them all hours of the night talking loudly to their acquaintances as did the housekeeping each morning and despite the Do Not Distrub sign hanging on the door, they happily stood chatting and vacuuming right outside our door at 8.00am. It felt like they wanted you out of the room asap...
Breakfast was provided via vouchers as my OH is a HHonors Gold - this was a continental buffet which is normally $16 and it was mediocre at best. You could upgrade to a cooked breakfast for a further $4 which we did on one morning but not on the next as it wasn't that good. 
If we didn't have the Gold perks the costs above the room rate ($179pn plus tax) would have added up - $15 or $20 for wifi (24hrs) in particular (it was still added to our bill and we had to get it removed at checkout) The other cost we couldn't avoid was parking at $20 per night. This was for self parking. Don't know how much valet parking was. This seemed very high and unnecessary for guests given that the room rates were on par with downtown Seattle prices.
The hotel is definitely convenient for the light rail system and the airport. Other than that, I would choose elsewhere.