More accurate rental estimation

[Xin Peng]

As title suggested, there are estimations from BP calculator as well as other websites (Rentometer, Zillow etc.), but IRL multiple factors could impact rentals (location, appliance, interior/exterior design etc.). How can I take into account those factors to get a more accurate estimation on rentals (similar with comparative market analysis)? Or take one step back, is this the right direction (the CMA approach)? Thanks.