After installing the dependency python-desktop-notifier remove python-mistune and python-sphinx_mdinclude (only needed for make). Then maestral will build properly. Alternatively, comment out lines 35, 52, 53, and 66 in the PKGBUILD before building if you need to keep python-mistune on your system for another package. I have only adopted maestral and it's related packages recently but will look for a better solution.
Edit: It looks like m2r2 has been replaced by sphinx_mdinclude on commit d61cb77. This issue should be corrected and build without intervention when 1.7.3 is released.
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