Stick to what happened
Every review must describe a real transaction between your business and the reviewed client. The clearer the facts, the more useful the review and the harder it is to contest on appeal.
Good notes read like a brief log entry: who did what, when, in what sequence. Bad notes read like a complaint letter or a character assessment.
Good: "Booked 4 sessions, rescheduled 3 of them with less than 24h notice. Final invoice paid on day 38 after two reminders."
Removed: "Total nightmare client, totally unprofessional, do not waste your time."