I usually start by analyzing data like population growth, job opportunities, and rental demand.

There are a lot of markets with solid job markets, strong populations, solid rent growth, but when you are talking ONE property, unless you are considering highly rural areas, it likely doesn't matter.  

Here are some reasons to get the ball rolling:Thriving Market: Florida's population continues to boom, fueled by warm weather, a strong job market, and a business-friendly climate.

We increased the rent slightly after the first 24 month lease and were able to recently increase the rent when the first tenant moved out.Lessons learned?

There is so much growth here - population growth, job growth, and companies moving and developing here.

Rent rates have increased so quickly over the last few years.

The increasing barrier to entry results in fewer new STR's coming available for sale, but also fewer options for guests to rent. 

Columbus also has great macroeconomics - lots of job growth, population growth, and major employers developing here.

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 growth is low, so the long term outlook is unclear.