Lower income areas tend to see lower rents, slower rent growth (Outside of initial renovation).And, if you are taking out commercial loans, there will be a DSCR test along with the appraisal and LTV.  

As a broad rule of thumb, the 50% Rule for SFRs states that about half of the rent will go to non-mortgage expenses.

Yardi tracks vacancy and asking rents at each property over 50 units on a monthly, quarterly and annual basis.

Keep in mind that when you are renting your place, these websites don't always talk to each other so check to see if your property shows up in a particular website. 

If it's a rental, you can structure the loan so that the monthly PI is lower than the rent income.

Rent it and once your comfortable you can move one on the 2 property.

You might want to consider negotiating with the seller to resolve these issues as part of the deal.House Hacking: Living in one unit and renting out the others can be a great way to cover your mortgage and build equity.

Can you convert it back to an Airbnb for additional income and use the proposed rents to offset the mortgage so you can buy your new home? 

Do the work yourself do not buy a property that someone just paid little to nothing for renovated and now is asking Max market price.Find a TLC project and over time or when you get extra cash fix it up and renovate and higher rents will follow. 

Do you mean completely turnkey and new or renovated and rent-ready?