To be honest, I could see the benefit of this and this sounds kind of nice for a quick visit to a new place or a nice break because it’s basically 2.5-3 days in a location when only one night requires actual sole responsibility, which means more time to explore the area. (if that’s what the HS is looking for)
I, personally would could that as a 1 or 2-night listing on TH because that 3rd day after is basically me just housing a couch surfer, but that first orientation day and the actual sit would be the official sit in my mind and coverable based on TH T&Cs.
There’s another thread posted that talks about this: "Consistent Person Wanted"