Once they have seen the property and are interested, the prequalification and background checks will do the rest of the work in weeding out undesirable tenants for you. 

It is the perfect home for me (as an airbnb) but it's undesirable to a regular person since it's dated (its a late 1960's home).

After finding outlets and switches placed in bad spots and plumbers who wanted to argue about the use of Pex manifolds my subsequent projects I literally would pound all the electrical boxes and label what they were for and buy all the the materials myself. 

Do you already have some kind of pre-screening questionnaire setup to weed out undesirable tenants?

A Lot of turnkeys are going to these undesirable spots and its highly possible you'll end up with more liability with turnover rehab requirements.

You already decrease that ability by buying property in undesirable locations.

Avoid affordable (undesirable) properties that will typically have higher maintenance and vacancy, and buy A or B properties with less maintenance and better appreciation, which is where the real money is made.

Maintenance/cap ex, insurance, if a rental PM, bookkeeping, misc.The fact you have a loan means 1) leverage 2) equity pay down.In addition, there are tax benefits.So I will do some rough underwriting as an OO non-rental at 95% LTV (because FHA has some undesired consequences that make the 1.5% difference in LTV worth avoiding the FHA).equity paydown: 20% (using OP interest rate at 95% LTV and not counting closing costs). 

The state will get its pound of flesh and my liabilities were better managed by executing perfect permitted work and excellent insurance.I'd sincerely recommend having a savvy CPA, Lawyer & Insurance broker.

An algorithm will probably tell you that undesirable property is an amazing "value add" opportunity.