My parents, others in my family, and a couple former co-workers have had a rental unit or two at one time or another. Exactly one of those didn't strongly advise against it, and that one said his situation was good only because he'd been careful to buy units where they were almost certainly going to go to nursing school students, who are likely to be relatively-stable, stick around for at least a couple years, leave before long if they can't pay anymore for some reason, and extremely unlikely to trash the place or try to run a meth lab out of it or anything like that. In all other cases the complaints are similar: the return on time and money invested is just way, way too low to be worth the risk & frustration.

But, none of those engaged a property management company. Maybe that makes the difference.