The apartment is very clean, has all the facilities for a family (2-3 people) to stay over for a few days: clean towels, bed sheets, plenty of utensils/plates. We cooked dinner for a few nights and watched Netflix while eating dinner, so it feels like home.
William has been a great host, and provided very detailed instructions to nearby restaurants and activities. Checking-in and out the apartment is very straight forward and WIFI works just fine without needing the host. William replied our email and update very fast.
Location wise, it's very close to Seattle's downtown and major attractions. We rented a car and drove around. Parking behind the apartment is a bit difficult but we ended up parking a bit farther away and was just fine. The apartment is next to I-5 so getting to places is very easy.
The only downside is the noises from the highway. It doesn't quiet down in the evenings so if you are sensitive to noises, you might want to bring earplugs to help you to sleep well.