I would respectfully ask any reviewer to look a top reviewers and use the best format from their reviews, you can still stamp your own mark on them and of course read the rules.
I think a minimum a reviews needs
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When it happened e.g. 2017-10-16 if it's more than 2 months, don't bother
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Name and approx location - e.g. Sue - Central London
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Price paid and service expected - £100 -BBBJ/OWO - CIM and Snowball, and sex protected
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Then some short prose that explains what happened.
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Maybe a summary for tl;dr types
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Would you return and if not why not
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Discuss or not as it's been done to death many times already. Spelling and grammar aren't too important, so long as it's readable.