Stayed here with a group of friends and the location being so close to Ballard's main street (10ish minute walk) was great! The Airbnb was generally pretty clean, though one of my friends got a bug bite after lying on the daybed on the second floor. We also initially had some trouble with the shower because it was hard to figure out how to get the water to go entirely through the shower head and not through the middle hose, and the tub's pipes are old and rusted so we had difficulty with the water draining. Our host was very responsive though. He gave us access to another bathroom nearby as well as got the plumber to help fix the drain the same day we noticed the issue, so major credit to our host for resolving it so quickly.
This might have been my fault because I thought I had checked for AC before booking, but it turned out that AC was not available. On the lower floor the fans provided were enough, but staying in the summer on the second floor got quite stuffy even with fans and windows open. It's also easy to hit your head on the ceiling on the second floor, even if you're not very tall.
Parking was also very tight on this street! We were generally able to find a couple of spare spots for our two cars, but we did have to park on other streets some of our nights there.
Overall, our host was great and the location was great for walking to Ballard or taking a Lyft/Uber/Bus to downtown Seattle, but it might be a bit tight to have adults using the second floor. I think if we had been a smaller group of people (<6) use the first floor only, that would have been better.