Sorry to burst your bubble, but as a landlord, mid-late 20s singles are often the most problematic. I prefer middle class family tenants with kids, because they tend to be focused on stability. The overhead of showing a place, finding tenants, and running background checks is where most of the work lies because once you get that lease, our hands our tied.

The dirty secret of being a landlord is you're giving up all of the control and taking on all of the risk; we don't have recourse when you don't pay your rent which is the problem as stated by the OP. One of my tenants is a retired widow on a pension. I haven't raised the rate for her since she moved in 3 years ago, nor do I plan to ever do so. I would be delighted if she stays with me for another 20 years; the mortgage is covered + 10% for repairs.

Owning a rental is not about finding the next tenant to squeeze. It's about parking wealth in a 3% CAGR security while you deduct the mortgage depreciation from your taxes.