I just stayed at an apartment in Paris with 10 people for 4 nights. A cleaning fee was charged ahead of time, which I knew about and expected. Upon arrival, our towels were still wet in the dryer and I told our host it was not a problem. There was a mop bucket full of mop water left in the water closet area. 2 of our duvet covers were still wet, yet placed on the bed, but I did not make a fuss about either of these things - I just thought, it is what it is.
I did inform our host that we were celebrating Christmas (as the dates for our stay included Christmas Day), so there would certainly be excess trash due to gift opening. I asked him what I should do with the extra trash and if he would like me to separate the cardboard out. He pointed to some trash bags and said yes to the cardboard.
We vacuumed up every day and washed all of our dishes. There was, however, quite a bit of excess trash but it was all bagged up, and the cardboard was all broken down and stacked up. We were not asked to strip linens, so we did not.
I tried for 24 hours prior to departure to make contact with the host regarding check out procedures and he never replied. Finally, about 15 minutes after check out, we decided to leave the key with the front office of the building.
On our drive home, I received a phone call from the host telling me that I was disrespectful and filthy. I am floored and confused. I asked him to send me some pictures of what he was referring to. He sent pictures of literally minuscule pieces of trash like a wrapper under a bed or a clothing tag in a corner?! There were things left in the fridge upon our arrival, so we left those things there, plus a couple of our own, that could be useful to the next person. Am I being unreasonable? I really do not understand.