Why ReportDash Addon for Google Sheets™?
One of the simplest of tools out there (, or at least we want it to be :) ).
To fetch the data to Google Sheets™ , simply link the third party accounts, select the required metrics and dimensions from a dropdown, and hit 'save'. Done!
It also allows to blend data from multiple data sources, and perform a wide range of custom computations, without requiring any programming knowledge.