If so, does the net proceeds from the property sale contribute to this number, or is this just in reference to our AGI as a household? 

If there is a decrease in population I imagine its more because smaller wealthier households have replaced larger less wealthy households.

Median Household Income Growth - www.City-Data.com4.

The metrics that I have incorporated into my are as follows:- Median Home Value- Median Rent- Median Household Income- Poverty Rate- SNAPS (Food Stamps) Rate- College Graduation Rate- Vacancy RateI have chosen these because I believe that these metrics give the best indication as to the "risks" an investor will face when selecting a location to allocate into. 

My wife and I are both employed (W2) and make about $60,000 a year in household income.

One thing to keep in mind, the city is implementing a limit on how many STR. 5% of total households can operate as an STR.

The Housing Authority will review the household makeup (I.e family size) and income. 

You can take a look at their site and they have options through which you can filter equity %, household ages, last market sale date, etc.

For a 2000 sq ft house, how much do you usually spend on labor (design, furniture assembling and household items organized) to have everything set up and ready for guests to check in?

Such changes can be done with an addendum or by signing a new lease.We have a procedure for adding or removing a person from the rental agreement, as changes in household make-up are not uncommon.