We've got strong job growth (tech, healthcare, education), stable population growth, strong rental demand, and plenty of value-add opportunities in multifamily.

I consider inventory rates, price trends, unemployment data, population growth, job growth all to be relevant to where a market is at and where a market is heading.

With growing Latino population that tends to have a lot bigger family, I am not worried about finding guests.

Las Vegas's average annual population increases by 40,000 to 50,000 per year.

This window of opportunity in Austin May end up being short lived, the sidelined buyer demand has been stacking up and the influx of population is never ending.

Seacoast has a mix of those, especially in towns with younger populations, think Dover, Newmarket, Somersworth, Sanford, Biddeford.

I agree with @Jonathan Greene that the question is vague, so my advice will have to be as well.The short answer: MTRs are real estate, so just like all real estate, any place that can long-term-rent cash flow with increasing jobs/population can be a suitable site to purchase. 

Population and economic growth, strong tourism, proximity to other New England cities.

Tampa is a strong market with steady population growth and high demand.

The big pros are the strong job market (lots of major employers), good population growth, and still-reasonable entry prices.