@Kelly149 Hey Kelly! We airbnb a restored 1971 Nomad in our backyard. All in all it has gone great! We have taken several steps to guard against rookie errors or guests that don't read.
Over the last two years, out house manual has gotten a little long and we do utilize little notes as reminders but they are cute and tastefully incorporated into the decor. Some examples: one the mini fridge plug "fridge, please don't unplug" on the toilet sprayer "this is for cleaning the toilet bowl, not for cleaning human bodies" and so on. The only guests that have done any real damage in 2 years were very intoxicated and would have probably damaged any space.
We are very strict about a 2 guest max and a 4 night max. We warn guests that they are booking an unusual listing and only to book if they love the idea of staying in a camper.
We always offer to set up the second bed in advance if guests are not comfortable (though that might not be an issue with an airstream.) We have disabled the stove and put in a microwave and coffee maker. We offer the use of the stove in the house. There is no shower in out camper so we do let guests use the shower in the house too- but we limit house access to 6 am - 8 pm so people aren't coming in while we are asleep and this has not been a problem,
Most importantly we went ahead and ran a sewer line to the camper so we can connect the hose and drain the toilet and spray it out without much fuss between guests- hence the 4 night max. This was an expensive investment up front but makes the whole thing doable and allows us to host one night stays without difficult toilet logistics.
Hope this helps!