I checked the V1/modules API and found that "Magento_Review" is present. What I couldn't find is the REST API to access and add reviews for a product.
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It seems that is not implemented yet.
I thought that was implemented in catalogProductRepositoryV1, but isn't and can't find any special end-point for that too.
I wish I'm wrong
$reviews = Mage::getModel('review/review') ->getResourceCollection() ->addStoreFilter(Mage::app()->getStore()->getId()) ->addEntityFilter('product', $product_id) ->addStatusFilter(Mage_Review_Model_Review::STATUS_APPROVED) ->setDateOrder() ->addRateVotes();