@Fabienne425 Thanks for explaining what you were seeking.
While I agree that this host is handling his camera issue very wrongly, and that you have good reason to be upset, that isn't a reason to expect to be refunded, even though you didn't realize some of the cameras were there until the end of your stay. You stayed the whole time, using the utilities, the sheets and towels and whatever else was provided and were resident in the space, so the cameras are not grounds for a refund.
Reasons for refunds are if the place is dirty or not as described and you cancel and leave right after arriving, if the appliances aren't working properly, or there is no water, or electricity, or no internet connection when one was promised. In other words, what you paid for wasn't provided.
If you had just reported the issue to Airbnb, instead of using it to demand a refund, Airbnb might have suspended the host's listing pending investigation, because they do take undisclosed cameras and invasion if guest privacy quite seriously.
As far as the review goes, it's almost impossible to get Airbnb to remove lying reviews, whether they are written by hosts or guests, even with photo documentation. Hosts have had to live with reviews full of lies, claiming the place was filthy, and even though the host has 100 reviews saying it was super clean, Airbnb won't remove the review.
Don't worry about that review. Your response makes your side of things clear, and luckily you have several other reviews, all of which attest to the fact that you have been a great guest. Future hosts will see that review as an outlier and disregard it. As a host myself, seeing a review like that would make me go look at the host's profile, where I would see that he has had complaints before, and also that he is ungracious and defensive about accepting criticism and guest complaints.
You have done everything you can do-reported the cameras to Airbnb and left an honest review to warn other guests.
I would suggest you now put this bad experience out of your mind and move on. You have obviously had good Airbnb stays before and I'm sure you'll have many more in the future. Hosts also get some horrible, disrepectful guests- these things happen sometimes. Luckily they are the minority, not the majority of Airbnb experiences.