I needed a place to crash while waiting for a flight out of SEA, so I was only there for 1 night to sleep and groom in the morning before a long day of flights. The host was very accommodating of my late arrival and was able to get me checked in after 10PM. The bed was comfortable and there are panels set up that allow semi-privacy.
The location was ideal - it is right next to the link, so getting to the airport in the morning was super easy.
I did notice that the vast majority of people who stay here - at least per the reviews - are men. As a woman traveling alone, there was something disconcerting about that while I was making the booking, but I did pay specific attention to reviews that were written by women, and it seemed like a safe enough bet. And it was. I felt completely safe while there.
My only complaint is that the one shower is in the men's bathroom, so there's a urinal in there and it feels a little awkward to use that bathroom. But both washrooms are single stall, so you don't need to worry about someone using a urinal next to you while you're trying to shower. You just need to ignore the gendered signage if you actually want to shower in the morning