The Google Reviews Feed For Oxygen Builder is a simple way to showcase your glowing reviews on your Website, without the need for an expensive, heavy plugin.
This widget, installed by copying and pasting shortcodes, displays the reviews of any location with a PlaceID.
It's really easy to install, configure, and style. There's clean, commented code that makes it easy to extend, and a ton of default options to play around with. Specify the number of reviews, minimum star ratings, and more. It'll pull the most recent reviews, the star count, and the associated reviewers image.