This location is absolutely perfect for someone wanting to explore Seattle and stay in a quaint little part of town but still close to the action. Ballard is definitely a fun location. Lots of stuff to do within walking distance and the public transit is two blocks away. (Use it over ride-share apps, it's cheaper in the long run, just takes a bit of planning and forethought. There are two easy apps plus Google Maps has your back.)
The interior was great. One thing to note, and something that should be put into your thoughts when booking, there is NO air conditioning in this unit. This is common for the Northwest, I'm told, so it may not be a big deal. Weather was perfect for us and it never got hot, as we had the window open and a nice breeze going. Tim states in the listing that there's no A/C, so it was totally my fault for not realizing it, and honestly didn't detract from the trip a bit, but I do think it's worth mentioning.
The bed was extremely comfy and they had plenty of pillows of all shapes and sizes. There's plenty of towels in the bathroom and every available inch of space is used wisely. There's a decent kitchen setup if you are staying for more than a couple days and plan to cook meals there, along with a perfect little "dorm fridge" to hold things.
Check in and out was very easy, and the entire neighborhood is very quiet, so a peaceful night's sleep was easy to get.
All-in-all, a dream vacation spot.
Side note/tip: If you want to view the sunset from the Space Needle, which I highly recommend, please plan to "book" your arrival time about 75-90 minutes prior to sunset, as it can take that long to get through the queue and up the elevator. And the best view is from the rotating floor one below the open-air viewing area (just don't look down.)