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Hi @Marilyn395
yes, @Emilia42 is correct, You need 200 five star reviews to make up for one 4 star review.
A bunch of pretty math-savvy people have been working on this calculation around the world, including myself, and I can confirm that Emilia's information is right.
Here's the whole picture: If You get one low stare review, how many 5* reviews do You need to make up for that? These are the results:
to make up for one 4* review, You need 200 x 5* reviews
to make up for one 3* review, You need 400 x 5* reviews
to make up for one 2* review, You need 600 x 5* reviews
to make up for one 1* review, You need 800 x 5* reviews
Now let's take a quick look on how airbnb is displaying the average rating.
3 years ago this is how an average 5* rating was displayed. To have this 5* rating displayed with one of Your listings, mathematically You needed an average rating of 4,51
Then airbnb started to show half stars. This is how a 4,5* rating was displayed later.
In order to have a ***** star rating displayed, mathematically You now needed an average 4,76 rating. Again, later, airbnb started to only show one star in front, followed by figures. This is how an average 4,9* rating was displayed last year:
In order to have an average 5* rating displayed, mathematically You now needed an average 4,96 rating.
Early this year airbnb changed the way they display the average rating again. Till to date, they are showing 2 decimals behind the comma:
And all of a sudden, in order to have a straight foreward 5* rating displayed, mathematically You now need an average 4,996 rating.
What I'm trying to say: While in 2017 You were a perfectly ok 5* host with a mathematically average rating of 4,51, today You are a looser if You don't reach 4,996.
Back to Your case: Until recently You had a perfect average 5* rating. Now as You've got one 4* rating, You need 200 x 5* ratings to make up for that and Your are trying harder and harder and harder to please 200 guests. Let's assume, You're successful and you do get the 200 ratings You need. Then, once again, a perfect 5* rating will be displayed for Your listing.
But the very minute You are back to You straight foreward 5* displayed rating, airbnb again changes the way they display the average rating:
Now You need to please Your guests even more that You did before, because 200 x 5* ratings will not be enough, with 3 decimals displayed You now need 2000 x 5* ratings to have a straight foreward average 5* rating displayed.
Marilyn, You're fighting an uphill battle that You can never win. Don't ruin Your life trying to be a 5* host.
cc: @Anonymous @Fred13 @Charles224 @Super47