@Inna22 , I SO hear you on this one. I have an older style house and I was getting marked down on cleanliness also. When I asked what was dirty, guests would refer to chipped laminate, or scratches on the floorboards. So I do a couple of things in a similar vein to your idea.
I say in my listing "Large, practical, OLDER style kitchen. (It's dated and a bit worn around the edges in places but it's scrupulously scrubbed)" and "the ensuite's dated, but CLEAN and the water pressure is FABULOUS - we guarantee you will LOVE to have a shower here."
in my welcome message after booking I say, amongst other things, something like, as per the listing description both the kitchen and bathrooms are far from state of the art - there is minor cosmetic damage. However everything is routinely scrubbed, and it's large, practical and functional.
and finally in my house manual
The kitchens and bathrooms are routinely scrubbed. . In some areas there are cosmetic issues – as repeatedly noted in the listing. There’s a bit of peeling of some laminate, there’s some discolouration, there’s some staining, especially the grout in the bathrooms. This is not from a lack of cleaning. It’s age. If you feel something is genuinely dirty or there is a problem, just let us know and we’ll do our best to rectify
Not foolproof but since i've implemented it's helped a lot.
I think the info in the welcome message packs the biggest punch so IMO you're on the money
Cheers