Airbnb searches do not use listing titles, @Danni25 , so use the URL. In your case it is https://www.airbnb.com.au/rooms/22342080
Return guests should be able to find you through Trips when they are signed into Airbnb. They can just look up the past trip, and then click on your listing page. Granted, it does take a few clicks, so it's understandable they might give up. It is nice that they are going to the work of finding you directly! It speaks to how wonderful you and your place are.
Hope this helps.