@George1803 If you stress about the odd review that isn't perfect or fair then I suggest you will never be happy hosting on Airbnb.
To be fair to Airbnb it is entirely possible that a host has forgotten a guest was coming or wasn't available to check them in or forgot (as I did once) to turn on the hot water. This doesn't make them a bad host - just a human one but it does explain why a review might be entirely fair even though all previous reviews were perfect.
Airbnb (or any company) is not capable of determining if a review is fair so they decide not to rule on truthfulness. This is understandable otherwise it would be too easy for a host to let down every 40th guest and get away with it.