I live in Tuscany, work in insurance, married last year and have been in usa for honeymoon!
While I did a walk through and found the place to be clean and suitable for guests, the way I've done several times before, one thing is certain - her definition of "clean" and "dirty" are very different than mine. I realized there was some language barrier and that this was the guest's first time using airbnb. She seemed shocked to find food in the fridge. I let her know that people live in these places so it's common to have food in the fridge.
The cleaning crew may have overlooked the shower doors but I assured the guest the place was cleaned before their arrival. After offering to refund the full cleaning fee, the guest still seemed unhappy. As I take care in making good experiences for all guests, I realize I can't actually make someone happy. I've used airbnb many times and have found some places ranging from extremely clean, very clean, average clean and so forth. Rather than obsess over the variations, I would have gone out and enjoyed the beach but that's me. I didn't try to change her mind only tried to help manage her expectations. I think she would have been happier at the Hilton.