The vacancy and turnover costs are what kill returns.

You may be able to slightly beat market vacancy, but I wouldn't count on outperforming by a ton.

Especially for newcomers, Capex, Repairs, and Vacancy rates are hard to calculate accurately.The property I’m analyzing is a Duplex in South Austin Texas.

Vacancy of 5% is 5 vacancies out of 100 months for 3 properties.

@Lucas Ritter  I would research my local market to see how much places rent for, vacancy rates, cost of housing and how much you can borrow from the banks. 

With a MFR, you have less vacancy risk, efficiencies of scale, and (if 5+) the ability to force appreciation.

Wondering how much to set aside for repairs and vacancy.

You could charge a penalty of one month's rent to off-set the risk of vacancy.

Then your P.I.T.I. upon Refi with taking into account for vacancy % and small CAP-X, it seems $60/mnth is low. 

This is also even before you account for any reserves for expenses such as potential vacancy rate, small monthly repairs, or large repairs like capital expenditures (like fixing the roof, HVAC).So I notice when I try to do these calculations on properties, I can almost 100% of the time afford a triplex over a duplex, even though it seems like it should be the other way around, BECAUSE the additional rental income of the 3rd unit really helps lessen how much I would have to pay for a mortgage.