Looking for a house we could house hack, had an incredibly low interest rate on mortgage and house has increased in value about 42%, an estimated 180k in equity.

It seems duplexes are valued on rent rates for the most part.

., $300 for paint and supplies) and add a fair hourly rate for labor.

It's an estimated cash on cash return given current rental rates subtract expenses assuming 7% interest rate, 10% management fee, 5% repairs, 5% capex and other expenses like mortgage, insurance, tax. it's a estimate to tell you what properties to analyze vs ignoreyou can see the are pockets of negative returns as well as pockets of positive return. this is to supplement the data @Devin Conley provided

Where in a standard market rate rental a stain like that could be handled when you get around to it and the rent would still be due.

Live in one unit - It's a great strategy when using a bank for financing as the down payment and interest rates are more favorable to owner occupants.  

Hell, I'll give a discount and we'll call it $2 billion. 

It earns a great rate of return compared to a bank account and is fairly liquid.

Nightly rates and estimated revenue based on all the other units in the area?

You can often get better rates with a national lender, but the customer service is non-existent, communication probably sucks, they may ask for the same documents multiple times, etc.