Market rate rent would be ~$130 positive cash flow per month.

@Jacob Northfield to me it seems like you got a pretty good deal. 80k with 2 units that could rent for $1000 minimum will cash flow nicely.

Putting together a simple model doesn't require too much advanced excel knowledge to at least calculate cash flows. 

While we give up equity by doing this, this allows us to do as many projects as our deal flow allows us.OPM - Other Peoples Money

In order to account for the cost/risk of your rental payment, I would measure it based on ($ cash flow)/($ rent).

How does the Bigger Pockets Rental Property Tool Calculate Cash Flow increase from year to year?

This lets you live in one apartment and rent out the others, which can help you pay down your mortgage and perhaps create positive cash flow.2.

You can't beat the cash flow.2. 

By taking these factors into consideration, you can maximize the potential of your investment and create a positive and thriving rental property.Positive Cash Flow:When considering a rental property, it's crucial to ensure that it generates a positive cash flow, as this indicates its potential to be a lucrative investment.

My focus isn't on substantial cash flow; I am comfortable with a modest gain.