Then you get to what is advertising a deal versus advertising a company.  

However if you want to generate more cash flow putting 15% down will help you because not only is it a lower montly payment but when you hit 20% equity they will remove your PMI.If you put down 5% I would stronly encourage you living in the Airbnb if possible and renting out the home so you can generate even more incomeIf you look at it like this it'll helpMonthly payment < Potential income + current rentIf you can move and reduce your cost of living that is always great at the bare minimum they should equal each other in my opinion because at least you'll have equity if the market you are choosing is a strong equity market.

Next, what is the cost of the renovation vs higher rent delta? 

How would you structure a deal so that the private money could cover the down payment and fund the rehab in order to minimize money out of your pocket and being able to pay the private lender off when you refinance? 

This is 100% top advice to think about - each state (and sometimes, often municipality/city) will have different processes, rules and yields for this - it is a very location-specific strategy and have to hyper-focus on a local market (more even for the rules/process than the real estate knowledge) to have success

What is a good starting place for an estimate to completely overhaul the interior of each 900 sq ft 3br/1ba unit as current tenants move out? 

That being said, I like to buy properties in cash to get the best deals and then delay finance them.

I used the values from the realtor.com website for purchase information and expenses, and the bank of america calculator to estimate closing costs.

I have found a few decent deals, but pretty hard to find value added or undervalued property. 

We are looking to do a private money lending deal with a company out of Chicago on a SFH.