American Host here who has extensively traveled via Airbnb in Europe & Central America. A few tips & observations:
-America, being a land of plenty for the middle and upper classes will have exceptions of certain things that everyone in the US has but many in Europe do not. For ‘normal’ Americans they will just expect these things unless told otherwise. Just as the British may expect tea and a water boiler, Americans will expect certain things.
Tip- Set Expectations: I’ve noticed that when I have difficulties its because I didn’t properly set the expectations right. If you are more concerned about maintaining a good rating rather than booking full, its makes sense to fully brief someone on the experience. For instance, I don’t have a microwave in my Airbnb, which is usually an expectation for most American’s. I’m very clear that they shouldn’t expect a microwave.
-In the US its typical for everyone to be overly friendly and polite, even though most aren’t necessarily as ‘nice’ or ‘friendly’ as their words and speech may imply. A typical ‘normal’ American may be rubbed the wrong way by terse or frank replies or other discussions.
Tip- When messaging or communicating with Americans, especially those of older and more conservative bent, it will pay dividends to be extra friendly and jovial in your words and demeanor. In my own hosting experience, even those who had critiques still gave me 5 stars and commented on my friendliness, etc.
As a Host in the US I obviously get lots of Americans but being a diverse country, many people of different ages, backgrounds, and nationalities. Of the 10 or so bad experiences the majority have been from older folks who treat the place like a hotel (no cleanup etc) and several within that subset have been Asians. Chinese in particular (usually exchange students in my location) are ofter rather wealthy so I assume they have different expectations and look at me as a service worker and less as a host. But overall I do think that younger guests are more apt to give better reviews and higher ratings.