@April---Andy0 it is not surprising you will get the odd rating below 5 when you see what guests are told each rating means. See below for the questions asked and the interpretation Airbnb puts on the stars. If you don't like the current categories what would you change them to?
How was your stay with XXX?
Terrible
Bad
OK
Good
Great
How was your check-in at XX's place?
Not at all easy
Not very easy
Fairly easy
Very easy
Extremely easy
How clean was XX's space
Not at all clean
Not very clean
Fairly clean
Very clean
Extremely clean
How accurately did XX describe their place"
Not at all accurate
Not very accurate
Fairly accurate
very accurate
extremely accurate
How well did XX communicate?
not at all well
not very well
fairly well
very well
extremely well
What did you think of the location? How did you feel about the area and neighbourhood?
Not at all satisfied
not very satisfied
fairly satisfied
very satisfied
extremely satisfied
Finally, was XX's place worth what you paid
Terrible deal
bad deal
OK deal
Good value
Great deal