I’ve heard it is bad practice to personally guarantee a business loan. 

Our minimum requirement for credit score is 580. 1 of the applicants credit score is 558 (this person makes majority of the income) and the 2nd person has a 661 credit score.

Is there a bad market to BRRRR?

There is about $10-15k of rehab work and it would be nice to capitalize on rewards while building credit. 

My son just got married to a German young lady and they teach it over there....her spending/saving habits are incredible.Re your questions, I'm far from an economist but from what I hear discussed, the real worry is having this situation get so bad that we are no longer used as the world's reserve currency.

You'll need to credit their rent for the time that the unit in uninhabitable. 

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

What a bad idea to look for only free systems. 

This can lead to more chances and give you a better grasp of the sector.To finance real estate transactions, it's critical to have a solid credit history.

There are too many variables like the possibility that rent rates will increase dramatically or the tenant will turn out to be bad and you will need to get rid of them.