Here are some excerpts of what we conveyed to Airbnb support when we were compelled to leave the flat (after one day of stay instead of 4 planned and prepaid nights):
"This place (which could be very nice) is dirty and dusty. And it smells (dirty rags?).
We had to clean all the tables and the table around the sink (dust, hairs, dirt). The only place to put clothes on are the chairs, which are also dirty :)
Bathtub is greasy to the touch, as well as the (chaotic) kitchen with greasy cutlery.
Two of the 4 provided towels were just bought - in original packaging (thanks), but not washed (????) and that is why leaving some lint on your skin. Another one, to the contrary, is old, and lives lots of dust because of the age." I had to dry my face after morning washing with paper towels not to be covered with the lint...
To elaborate on dust: when leaving we looked at the floor under the bed and found a slipper covered with the dust to such extent, that made transition from the slipper to the floor smooth. In other words, the slipper became a part of the floor...
The apartment has it's advantages: situated in the modern district of Paris with bicycle roads along the channel; having really nice terrace with flowers; quiet environment in the daytime and night life in the night. Bed linen was OK in quality and freshly washed. We had also a warm welcome and valuable advice from Irené, the host's sister. But dust everywhere in the flat and grease in the bathroom and kitchen ruin it all completely.
We arrived late after sleepless night and had a trip ahead where Paris was just a lay-over. In the morning we realized how dirty it was. To move out as soon as it was possible was the only decision for us even without knowing whether we would have any compensation from Airbnb. With this flat we lost time to book a hotel and change location instead of spending time on sightseeing. Airbnb was very helpful and quick to refund.