Make up an address. As long as you have the name of your town correct, you can always message guests info and email them a map on getting to your place and explain that there is no actual address, because that's how it is in your area. The only problem is that airbnb may reject it as they can't place it on a map.
I live in Mexico on a small dirt road off a long dirt road, and while there are quite a few residences in the area, and I do have an official address, no one would ever be able to find it by the address as most house numbers are not even posted on the house, and the numbers go in no discernible order.