They have a ridiculous and unfair check-in policy. If you don't show by midnight they get rid of your room. More annoyingly, however, even if you call well in advance letting them know that you will not be able to show before midnight, you will still be charged for that night. If you stay at this hotel (which is next to the airport) you better hope you don't have any travel issues (delays) otherwise you will be out of your money.

We have stayed here many times when we have an early flight out from SeaTac. We have never had a problem. The ladies at the front desk do a great job. And even though they advertise breakfast starting at 6AM, we checked out at 4:30 this morning and there was already coffee, juice, bananas, muffins and cereal out and ready. And the airport shuttle can drop you at the light rail station for a quick train ride into Seattle. We have already booked our return in February

We stayed overnight for an early morning flight. Ours was a good, clean room and right within our budget. I would stay at this place again.

We booked this hotel as it was close to the airport and fit our budget.
As an afterthought, I figured I'd check the reviews and was a little apprehensive before checking in.
We arrived at the airport and the shuttle came to pick us up within 10 minutes - the girl at the front desk was very friendly and efficient and the room was clean and comfortable.
I would certainly give this hotel the thumbs up.
I don't plan on returning to Seattle any time soon but I would certainly come back.