Hi @Gary-and--Georgia0
You can Google to find estate agents in Perth but their job isn't to help you identify the best locations for your STR business it's to sell houses . They should be able to provide you with general information of what different areas of the city are like . But they are likely to tell you what you want to hear to make a sale 😀.
why don't you join the local host Perth group and ask for advice there.
you can also use tools like Airdna to look at supply and demand for the sort of areas you are looking at.
many cities and tourist areas now have oversaturated markets so definitely worth you doing your market research.