My dear Holly,
Thank you for your stay. Just to make clear, your arrival was at night so the bathroom had been used all day by the other guests. It is understandable that it is not equal to noon when the cleaning lady goes every morning that at 10 o'clock at night. We ask all guests for responsible use of the shared areas, but I am not a police officer who is behind each guest to check that the toilet has been left clean after use. Education is received at home, not in an airbnb house. I am sure you agree too.