When to Pay Down Mortgage Principal Early?

[David Katz]

Recently purchased my first turnkey rental and started making payments on the mortgage.  Mortgage is about $134,000 at a rate of 4.875%.  The property has a positive monthly cashflow of about $300 before factoring in vacancy, maintenance, and capex.  

Do folks who own turnkey rentals with positive cashflow tend to pay down the principal on an accelerated schedule?   Is it all just a question of whether I can get higher than a 4.875% rate of return in the market?  Or is it a matter of finding a middleground where you can accelerate the paydown, but still retain enough leverage to buy your next property?