I don't agree neither understand part of this comment. About cleanness, although it is always a question a point of view, I am pretty sure the apartment was proposed in at least decent conditions. Of course, it is not a five star place, and doesn't pretend to be. I agree the gaz burner should be changed because it is getting old and it wil be very soon.
Let precise the situation about the beds, because from the comment, it sounds like camping accomodation wich is absolutely not: there is a 2 persons latex mattress on a bed (bought in January 2014) in the main bedroom, 2 one person latex mattress (bought in February 2015) on tatamis in the little bedroom, one little IKEA good quality sofa with folding bed for 2 in the little studio( I sleep often in it and although I am well over 60, never had problem), and a large IKEA good quality sofa in the main room. I cannot see any stacked mattresses anywhere. Telling that 'beds are rubbish' is not fair.
As for the stairs: they are about 30, maybe 35, easy going steps to reach the appartment from the street level, no lift of course because the building is from the late 18th century: too much? as for the the internal scale,it is explicitly mentionned in the des cription on airbnb that it is 'rather narrow and inclinated, not advisable for a person with limited mobility'.
Last, I suppose that the last observation about getting trapped on the balcony is a joke, but I am not sure to get it right. Is it a compliment?