You should spend some time looking around AirBNB in the "unique stays" section and see what's out there.
No electricity? "Off grid".
No water/shower? "Glamping".
Compost toilet? "Eco Friendly".
And most of these locations, if managed right (IE they're clean, in a nicely wooded area where people feel "Connected to nature" and the host is friendly) are insanely highly rated and often booked for months in advance.
There's lots of places exactly like this. Yes, no showers, no running water, no electricity...vault toilet or indeed... composting toilets. City people eat these places up as an alternative to camping.
Here's one (for example) that we have booked ourselves in March. I've mentioned it a few times in this thread. Checks all the boxes - no kitchen, no hydro, no water, no shower, compost toilet. $220/night. Sits at around 90% occupancy constantly and is booked months in advance. There was not a SINGLE day available through December and there's not a SINGLE day available in January. February and March are filling up by the day.
Deluxe Tree House 1 Hour from Toronto
www.airbnb.ca
This particular cabin has been on AirBNB for many years (although when the property changed hands the previous listing with thousands of reviews had to be replaced by this new one) and years later here we are, still always booked...and a 4.85 star rating.
At 80% winter occupancy that little cabin in the woods is making the host a staggering $5500 every month. And in the summer it's basically 100% occupancy, solid, April through November. $6600/month.