I have owned a number of residential and commercial rental properties out of state and they have generally been good investments. 

I wouldn't say that people in general like one type over another, but rather people in general cohorts (single, married - no kids, married - with kids, etc.) tend to gravitate towards certain types of properties based on their lifestyles.

Any general thoughts on investing in this market and cash flowing with 20% down?

Lower interest is generally better than higher interest if you are the borrower.

From my research so far, it seems the demand is pretty high in general for STR's, I was also looking at San Antonio but would prefer to be in Florida and Jacksonville is the city in Florida that fits my budget, interested to hear from anyone who may know more about STR's there and to connect with anyone.

Be prepared to start a lawsuit.2) File a complaint with state's Board of Realtors3) File a complaint with state's Attorney General's officeSince these are unlikely to be permanent solutions, you'll also want to start searching for another PMC.Recommend you speak with @Russell Brazil

Generally lower than ordinary income taxes on sale depending on your tax bracket and holding period.Whether or not you are considered a Primary Residence vs.

Lot of people excluding the most important R that differentiates a flip from a rental - the RENT part...financing generally changes if you don't have a tenant or lease.

I have heard that interest rates for a DSCR loan are generally 1-2% higher than conventional loans depending on the LTV ratio and credit score.

In general, if you get the keys from her, she has legally vacated the apartment.