I start talking to tenants about buying a home rather than renting during their application process.

Application / documentationYou will need to submit: a completed STR permit application, letter describing proposed rental use, floor plan, copy of a blank lease agreement, proof of ownership.Fee: The application fee is cited as about $63 for the application / two‐year permit in many guides.Tax obligationsHosts must collect and remit:Florida Sales Tax (6%) on rental stays of six months or less. 

It integrates with most major web browsers and it also has a mobile application that runs on your phone.

I set the Credit Score as 650+ negotiable in Zillow and I had two immediate applications with very bad scores. 

We embrace S8 applicants, but screen them just like any other applicant.Many have an entitlement mentality and try to leverage their S8 voucher by pretending to be helpless:1) A percentage won't apply because they expect a landlord to waive application fees for them.2) Many cry broke and expect a landlord NOT to charge them a security deposit.3) Many of those same S8 tenants trying to avoid paying a security deposit, won't make an effort to call the list of nonprofits we send them that will pay their security deposit if they apply.4) A lot of them try to avoid paying for utilities.

Hmmmm, I see a 2/2 apartment in the Slaughter/Menchaca area of South Austin that has been advertised on Zillow by a real estate agent for just shy of 4 months now without a single inquiry let alone an actual application. 

Keep documents on a running basis to make loan applications as easy and stress free as possible.  1000% agree with this

Is there a application out their that charges no fees at all? 

I don't see the benefit to not putting them on the lease.The first step is to run a full application, the same as you would with any other tenant.

That means rental application, screening, background check, and a lease addendum outlining the new terms.