Analysis for Good Buy (Duplex, House Hacking) in AZ

[Arin H.]

Property: $145k - Duplex (50% occupancy right now) (Zillow)

Rent: Found the ad for unoccupied rental at $550/unit so expected income of $1100 per month (Link to Ad)

Costs: Estimated from FHA scenario (at asking price, could also assume a hypothetical price)

^ Is the above calculator a good judgement of costs?

 When I am ready to invest in real estate, I want to be able to get a better understanding of how to determine by analysis what defines a good deal. How would you determine if this property could generate positive cashflow or "rent free" on a hypothetical purchasing price through a house hacking strategy?

I did some reading through this article as well but assume there is more costs I am missing from the above calculated costs. (Article)