My own experience in Mt Isa having held 6 units for the last 3 years is as follows:
Enjoyed fantastic capital gain, and some modest positive cash flow.
However.
I found that tradesman are expensive to the tune of 4 to 6 times what you would pay anywhere else. Forget renovations, building and beware repairs. You will kiss your + cash flow goodbye every time you get the call from the PM. Most units are rented furnished and that adds to the horrific maintenance cost. The worst offenders are the evaporative air conditioning units if they are old.
If your units are duplex, I had 3 duplex, do your best to get water meters on each unit or you cannot charge the tenant for excess water usage. I had to pay every year thousands of dollars of excess water and my application to council to supply extra meters is still in some draw up there. The council also still sends me the council rates at my home and in my name even when I sold month ago. The new owner must be thrilled.
Tenants are mostly very average even when they earn good money if they work underground. My units where located (sold this year) in two very good positions a few blocks from the CBD but on my visits there I found an enormous amount of advertising selling properties that are borderline or even in the middle of true no-go-zones. If you go there you will know what I mean. Such zones creep forward swallowing the one that are close because they cannot be rented but by the local government housing. Owners in desperation surrender their properties to them, and are then bound to pay horrendous repair bills inflicted by the housing tenants who systematically trash the place.
Yes the owner must pay.
Even good locations may be hard to rent once the tenant goes. I had occasional units vacant for months. I had one tenant committing suicide and the unit locked up for month, tenant not paying for month, eviction repairs anyway the usual stuff. Insurance? yes it helped but not always.
I made good money when I sold, yes, but to me to hold on to such properties for cash flow was definitely not worth my while and the bad blood with the real estate agency who behaved very poorly, PM changing at the drop of a hat, very strange attitudes ( As if they are the tenant's ombudsman) and total open slaughter with local tradesman.