Most banks I’ve talked to require a 6 month seasonal period.

The loan will be a conventional investment loan that will require 20% down and about a 8.5% interest rate. 

There isn't a one-size-fits-all solution as you mention, but I would be sure that this is something that you see as sustainable due to the substantial up-front investment that it requires from the outlay.

If they're only approved for a $1,000/mo voucher and the tenants wants to apply for your $1,350 unit, the tenant will be required to pay the difference themselves.

DSCR loans require you to cashflow.  

If the tenant fails to provide the landlord with the forwarding or new address as required, the tenant shall not be entitled to damages or attorneys fees under division (C) of this section.”https://codes.ohio.gov/ohio-revised-code/section-5321.16

Are you not required to personally guarantee the loan, when you typically would with a bank?

How do laws like this consider a requirement for the income to be 3x rent?

You could be looking at anywhere between $ 50K and  $ 120K  Depending on the site and permit requirements .  

If it was a 12 month lease, I wouldn’t require a monthly cleaning but at 6 months, I would like to make it a requirement.