Response from Kevin:
Just so you know, the house I rent out is my home & not for the sole purpose of Airbnb guest. So any food / drink in the fridge was not old but rather my own. (However guest are of course welcome to it ) I know that there are other rentals that have their fridges & cabinets food free but this is not the case with my home. I am sorry about the drainage problem. I did notice that there was hair in the shower/tub drain when I returned but I am happy to say that me and my plunger have solved the problem.