Be sure to check out the free tools BP provides to help analyze deals you may have and also market insights.

For something more robust, tools like Excel or online calculators from financial planning sites might better suit your needs.Your ROI Formula:ROI = (Net Cash Flow ÷ Total Out-of-Pocket Investment) × 100For your scenario:Net Cash Flow = Annual Rental Income - (Mortgage Payment + 401k Loan Payment + Other Expenses)Total Out-of-Pocket Investment = $40,000 cash + $50,000 loan payments over 5 years.I came across a piece in Bloomberg recently discussing creative financing, and they touched on ROI calculations for multiple loans.Personal anecdote: A buddy of mine leveraged a 401k loan for a fourplex.

It’s especially effective in eastern PA, where competition and inventory can be tough.If you’ve got $80K, I’d suggest capping your initial spend at $60-65K.

You can use Airdna & other STR estimator tools to get data on potential income/vacancy based on your location and property size. 

Did not know about tools on how screan tenants.

What makes it slow in this case is that you don't really start seeing real cash flow until after year five but it's more effective than rentals in that there is little to no maintenance.Sure you can live in a home while fixing it up with the intention of selling it for a nice profit later but I think many people are already doing that and the buyers of slow flips now also have that opportunity without having to qualify with a bank.

Also, your total returns go down without any leverage because you lose the multiplier effect of appreciation.Now, to answer your question.

(you know all the things we using in running effective and efficient private companies) it would be a different story. 

There are rental management tools like Stessa, Baselane, Innago, and many others that include income/expense tracking that handles all the accounting tasks and reporting you really need for rentals. 

Setup all business tools like a CRM, MLS access or RE software suites a webpage digital business cards a Facebook business account.