What's the lowest credit score you will allow?

The credit score is the single best indicator of how one pays their financial obligations.

If you have a 2 year work history, and go get a W2 job tomorrow, we could use your base pay right away (as long as it is "guaranteed hours" or considered "full time". 

I would pay them separately rather than giving a rent credit.

But, people will always be able to see the prior listing history under the Price History section of the listing.

If you use different sources it will be difficult to calibrate the different scores, but think of it as a percentage of the max available score.This particular score seems to be based on an applicant's credit history, including payment history, credit utilization, and credit availability. 

Verifying last 2 years of rental history very important!

Credit cards have the same limitation on the amount you can borrow and will likely end up costing more than private lenders.

The sub 550 credit score people come out of the woodwork to apply for this home. 

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.