If you're a single person staying for a week or two, this is a winner, so let's get the big one out of the way first:
The apartment is smaller, so if you're in town for a month, or if you pack like you are in town for a month, you may have too much stuff. As you will need to take the stairs, the less you have, and the lighter it is, the happier you will be. If you're bringing a mountain of stuff with you, you're not going to be comfy, you're not going to be happy, and you'll probably not leave a review that the owner deserves.
The location is top notch. It's within a couple minutes walk of almost every metro line in the city, so getting anywhere is a breeze. And it's by some of the best donuts (Boneshaker) and cookies (Scoop Me A Cookie) so that was a win right there. Ubers were in high abundance in the area as well, so if you need to get further/faster, it's no problem.
Check in was simple. Buzz yourself into the door on the street, find the keybox, open box, done. The cleaning person for this unit is AWESOME and super helpful. The owner's response time is also great, even when you're dumb like me & lock yourself out.
Wifi was super fast. I hit some speeds on my iPhone that I don't even hit at home with Comcast's best package.
All in all, if you're by yourself and you're packing light, definitely put this on your list.