HOW WAS YOUR STAY IN BELLAGIO?
This review built like booking.com one, as starting score value from 0 (if you do not give score on booking.com) to 10 (if you give the last emoticons from left to right on booking.com) with only five choices, so steps have score value of 2.5.

You could read here:
https://partnerhelp.booking.com/hc/en-us/articles/213302185-How-is-my-review-score-calculated-
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