Sorry this was your experience. We gathered all the garbage and placed it in two plastic bags before leaving. There wasn't an obvious place to leave it and no guidance was given as to where rubbish could be disposed. I don't think "very dirty" is an accurate description of any of the areas. We left the place generally as we found it. There was no "food" left on "all the tables", crumbs perhaps, but certainly nothing else. I guess we were in a rush to leave, and will bear your comments in mind when we use AirB&B in the future.
I hope you managed to have a good Christmas, and have a great 2015.
Steve (Gill's partner)