@Laura2592 I would respond, as a consideration to future hosts, as some guests may actually be open to explanation.
If I got a comment like that, I would answer,
" Hi XX, thank you for explaining your reasoning for giving less than 5 stars. It's always valuable to hosts to gain insight into guests' perceptions.
What I would like to explain to you in return, is that no hosts consider their listings to be "perfect"- every place has quirks, or audible traffic noise, or is in an area with lots of natural insect population, etc. So as you say, no place is ever going to meet the standards of perfection.
But a 5* rating on Airbnb does not mean that the listing has acheived some state of perfection- it means that you experienced it as expected from the listing information, that the hosts were appropriately responsive to any issues that might have come up, that perhaps things had been provided over and above what was promised- i.e. that the hosts obviously care about how they present their listing to their guests and do what they can to make sure they have a comfortable stay.
As well, hosts do not concern themselves with maintaining high ratings because they arrogantly think their place is perfect- it is because Airbnb considers anything less than a 5* rating to be an "improvement needed" or a "fail" for hosts. (Which I realize guests are not aware of unless they are hosts themselves). A 4* rating on Airbnb doesn't indicate that the listing wasn't perfect, it indicates that you were less than pleased for some reason.
Thank you for giving me the opportunity to explain, and I hope you can take this into consideration when you go to rate your future hosts".