Second time was the charm; actually, the first time was the charm, too. Location can't be beat, place was immaculate, very nice kitchen, furnishings good, nice bathroom, comfortable bed and plenty of storage.
Be aware, several steps up and down - typical for the area. Others have mentioned the noise (windows are roughly at street level) -- lots of traffic, sirens and the monorail. My trip in December was pretty noisy, this past April not too bad. Overall, if one can ignore the occasional bad night, the rest will be fine.
I particularly like the area. A walk of a mile to a mile and a half will get you to the waterfront, Seattle Center (including the Space Needle), Pike Place Market. Amazon Go is two blocks away, Bartell Drugs (which has food, drinks, etc. as well as the normal stuff) is maybe four blocks away and the Light Rail station that Caroline mentions is just a block past that.
For my purposes, Caroline's place is close to perfect. Washer-dryer combo works well once you figure how it works, full-size stove, dishwasher, good size refrigerator and adequate dishes and utensils. Probably exactly what most AirBnB folks would expect.
Other than the few minor distractions I mentioned, I don't see a better spot to stay in Downtown Seattle.