I have stayed at the Octagon 2 times now and am about to book a week in February. Both times I have chosen the cabin as I really like to have solitude on my San Juan trip. The owners/operators have everything set when you get here. They do not bother you unless you need something. In fact you might not see them until it's time to check out!
I have stayed at a different "historic" place a couple of times and I have to say, Octagon Inn is FAR superior. Everything you need is here to use. All the pans and dishes. This makes it easy to just get up, get dressed and hit the river.
The only negative thing I would have to say is they need to get some new mattresses. Last year I was waking up pretty sore. Maybe they have fixed this already. If not hopefully they will read this before Feb. 16th and look into an investment. Either way, I will be staying at the cabin if it is still available.