Response from Michael:
How nice of you to write that. We had such a nice time at your appartement :)
Yes, i think that if we have to pay an additional cleaning fee that means that on the last day it's unnesessary to clean dishes, esplecially when you leave early at the morning.
The only thing we're sorry is the stickers. They come out pretty easylly though, we remove a whole bunch of them by ourselves without a trace.
Is something in a flat was damaged? I suppose not. Is something was in need of additional cleaning? No, the usual amount. We left dishes, one trash bag and several empty bags. That's all. If you stay in a hotel you leave the room in a same condition - and without questions.