Let's analyze each issue you've mentioned:1) Tenancy Length: besides issues a landlord can't control, like death, sickness, job loss, etc., the actual management of the property & tenant play a large roll in how long tenants stay in their home.

As someone who used to work in SEO, I can see that the structure, length, and comparison format are classic SEO techniques.

I would check your price versus competition and check your length of stay discounts.  

So I am not very familiar with PadSplit @Najhae Robinson.All I know is the neighborhood backlash, the nightmare stories and the like.I have heard nothing positive about it.Oftentimes they violate the STR restrictions in cities because they will rent to anyone for any length of time.I would never look at this as a business model personally.

Amortization length along with any DSCR requirements comes into play also to determine what kind of down payment requirement you may have to meet. 

This is a task to handle carefully and at arms length. 

Scenario 2:In this scenario we take the base case mortgage presented in the Scenario 0 spreadsheet and apply an additional monthly principal payment of $300.00.The result is the effective amortization is reduced to 17.25 years and the total interest paid is reduced by $35,546.14 (45.8%).As you see, applying the $300/month directly to the principal of the mortgage every month from the beginning of the mortgage provides a greater reduction in the length of the repayment and total interest paid.     

The notes are 4 months in length. 

I'm still not going to post at length here as there is clearly more to come out, but the past few posts are interesting to me. 

This is often easier in lower tier markets where the appraisals are not indicative of how the property would sell in an arms length transaction.The other risk you run is over extension.