Earlier quoted context omitted.
Instead of asking customers to give numeric star ratings, perhaps a better option would be a short list of Yes / No / Unsure questions. Were there clean sheets on the bed? Were there any cockroaches? Did the appliances work? Etc. Such questions are more objective and less prone to inflation.
They also require more time, and most people don't bother to leave reviews anyway.
It's how the "official" reviews from Marriott/Hilton/etc all work