This listing is truly a once-in-a-lifetime experience, and I've been trying to book a stay with O2 Treehouses for a while now so I'm so happy I finally got the chance!
My girlfriend and I stayed fo stayed on an unseasonably warm fall night, so did not use the space heater although one was available. The description of the unique location was extremely accurate, with all the disclaimers and amenities made very clear. The hosts were super communicative and helpful with our arrival and checkout, even though were were slightly late to the checkin.
Although it is on the pricey side for an overnight stay, I would say that is is completely worth the extra $$$ for the experience alone :)