The amount that they're owed if they're the only lien holder?

In our area a one bedroom voucher holder can afford a two bedroom rent, so the only people who rent one bedrooms are people living in weekly rent hotels - basically one step away from homeless. 

https://www.primerus.com/business-law-articles/a-warning-to-investors-in-florida-superior-liens-survive-foreclosure-sales.htmThe mortgage holder's lien will not be wiped out by the HOA lien, so you need to make sure there is no mortgage on the property.  

They're here on a study Visa and don't want to anything that could compromise that.

Originally we were going to go with TenantCloud, but their payment service Dwolla, doesn't service non-US citizens and we have a few tenants who are here working in the hospital nearby through work Visas.  

I was able to say no based on her visa being wonky.Another part of screening, get good at telling people 'no'.

Some non-citizens have SSNs so that helps, others have International Tax ID numbers so that also helps, some are simply on an investment visa.  

How do you go about being able to rent to Section 8 voucher holders?

Welcome fellow buy and holder.

I have wholesaled many times and to be honest, I could not have wholesaled a single one as a newbie without the background experience and education I received by investing as a buy and holder, a flipper, and a developer.