Rawia: sorry I cannot tag you I keep getting an error message.
"What can I do to improve things for the next person?"
Ask the guests what they thought was unclean and what the noise was.
Check the apartment thoroughly, talk to your cleaners. Ask someone you know to walk through they may notice things you don't.
It's frustrating when guests complain and you have no idea what they are talking about. I had a 3 star cleanliness because guests did not clean up after themselves, they expected maid service, they were extremely messy and dirty! I also had a low value because a homless person asked a guest for money – in nyc the home of the homeless, and low stars for noise: sirens and helicopters and honking horns, so I have added that the city is noisy with a list of noises one will most definitely hear in any big city!
Nothing is too obvious to state for some guests.
Other than that I would forge ahead. You have great reviews. If they leave a less than stellar review, respond by selling your listing and proactivity and professionalism to future guests. See a post called "Tips for Writing Responses" (how to turn a negative to the positive). Good luck!