A friend of mine scored her dream home last month. 

-I have had some with a Vantage Score number when you run their credit, which is like a credit score. 

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

I use it for all of my out of state investorshttps://www.areavibes.com/It gives you a total LIVABILITY score for each street and zip code.

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

Agree with @Gorden Lopes - you will not find the 1% rule for A/B properties in Huntsville/Madison right now unless you score a unicorn of a deal, or put up an enormous down payment to force cash flow.Even C properties right now are not easily 1% rule applicable.  

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

The only time we ever have a leverage cut is if the appraisal comes back rural, market rent is significantly less, or the credit score dropped under 700.

Rates as of this posting date vary but are in the 6s and 7s (or possibly 8s if not a top tier credit score or a foreign national loan as considered a higher risk and will be reflected in the rate).