@Svetlana142
If it is make or break for you, you should simply search for a place that includes washing machine availability in the amenities list in the first place.
There have been many discussions on the forum previously regarding washing machine use. Issues such as misuse, overuse, abuse of detergent supplies for example, can deter hosts from making machines available.
In my shared space, I don't list the machine as an amenity. I do allow guests the use at my discretion and proffer use in appropriate circumstances, while retaining control.
In your case, as I said, why book then start asking about amenities that aren't listed. Can a host trust you as a guest?