We spent three nights on the Sally S. We enjoyed the "uniqueness" of the boat. Kelly met us on time and gave us a brief tour. The interior is very clean and has enough room, given that it is a boat. Keep in mind that it's not a luxurious hotel suite and no one is going to make your bed or wash the dishes. It is a different and pleasant experience being on a boat and watching sailboats and large yachts travel past from, or to the Ballard Locks.
The location in Magnolia, is convenient to Ballard and only 20 minutes or so from downtown. There are no restaurants within walking distance, so you will need to travel or make use of the well furnished kitchen.
We recommend the Sally S to anyone looking for a place that is interesting and not the routine.