Best way to understand this is research appraisal standards and means. 

@Daniel GrantzRecommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

The rules and payment standards vary significantly from one area to another, so familiarizing yourself with the local housing authority's procedures is key.

The real estate investing industry uses "Classes" to rank property performance risk, but there's NO agreed upon industry model:(Here's what we use for our Metro Detroit market:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

I know property managers in every state who use non-refundable application fees and it is the standard for every class of property and applicant.

Looking at this mathematically, if you assume a 50% non-renewal rate (industry standard) and use the low end of the range of $5,000 per non-renewal, there is a loss of $50,000 per year on a 20 unit property.

One key he found was mixing a welcoming atmosphere with firm guidelines.. it typically falls under standard tenant landlord laws for eviction.. so you’ll want to double-check local regulations.You mentioned Furnished Finders and Padslipt.com.. from what I’ve heard, those can be great if you’re targeting traveling professionals or short term visitors.

Hi @Jorge Lopez appears the iOS version of the bigger pockets app has been pulled off the App Store, usually that happens because apps are not getting updated to meet current standards but I would have to defer to the BP team to clarify. 

So, my standard thought is they are either not as successful as they put out in the world (and need $20-30k), or they are charging you to sell you something more.

These are non-standard setups.