My boyfriend and I were in town for a concert and had the privilege of staying on Sally S., and we loved it! There's something so peaceful about sleeping in a vessel being gently rocked by the ripple of the water and listening to the rain pitter-patter outside. It was very clean and space was efficiently utilized so it feels quite spacious. The location is a lovely escape from the hustle of the city without being too far from city center; about a ten-minute drive. There are cute coffee shops, restaurants and breweries in the area as well, mostly within walking distance. We enjoyed hiking in Discovery Park which is about a 3-minute drive from Sally, and found some good food in Ballard which is just over the bridge. The houseboat neighborhood is quiet and the people mostly kept to themselves.
I recommend this booking for a couple trying to get away and relax for a few days, but I will warn: if you're susceptible to vertigo, it could be exacerbated after a few days on the boat. Don't let this discourage you from experiencing houseboat-life, though! It's worth it for the unique opportunity. I wouldn't change anything about our experience and we hope to return in the future.