You need to research the market based on how the property is sustainable, not just like everyone else is buying homes, So should I? 

There are no comps because there are too many variables that could make 2 exact properties on the same street have very different numbers in gross revenue and average daily rate, a lot of it has to do with aesthetics, furniture, how the property finishes and/or if dynamic pricing is in place, listing optimization, professional photos, etc...you can google all the small expenses such as cable, internet, taxes, etc. but if this helps, here's a 4:3 in Atlanta who's expenses don't fluctuate so much compared to our other properties:FIXED EXPENSESPrincipal & Interest$1,311.98Taxes$67.34Home Insurance$126.03Mortgage Insurance (PMI)$165.46City Property Tax$208.63Cable & Internet (AT&T)$134.27Security (ADT)$59.00TOTAL FIXED EXPENSES$2,072.71VARIABLE EXPENSESGeorgia Power$62.33Water (City of ATL)$107.02Gas (Scana)$126.25

He bought some new furniture and did some work in the yard. 

Furniture / Upfront Cost - When I run my analysis, I always consider the cost to furnish the place as well, since that can be a pretty large upfront investment.

The people who life in the town are the people that are required to sustain the town, that's about it.Numbers below are listed for the package of 4 total units (2 duplexes):Price : $135,000Rents : $650 per side (4 total)Taxes : $300Insurance : $145Financing : 5.5% @ 25% down, 30 yearsCurious to hear your thoughts.

It has been sustainably growing since the Great Recession.

It worked out well, as the property was fully homestaged, which is not very common here in Valencia Spain, and the buyers even purchased the furniture.

Find the cheapest place to live.Buy a plug in radio for entertainment.Just get a mattress for furniture.

The triplex can be very tricky due to the self-sustainability rule but quad and duplex (especially so) can be awesome. 

@Jonathan Wooten Mike @ The Sustainable Handyman has been great for many types of jobs so far.