Entering the apartment there was dust, filth, and grease on walls, lamps, behind doors, in cupboards, on the furniture. The same for the stairways getting to the apartment.
The staff was very responsive to fix the problems including providing us with new cookware because the cookware in place was ready to be retired. After intensive cleaning two times over two days, it was no longer impossible to stay in the apartment. That meant that we accepted sticky cupboards, stains on walls, dirty pots and pans and plates and cutlery, dust here and there, a sofa with discusting marks of food or what have you, and a filthy stairway to the apartment.
Coming back home, we have confronted the company with the situation and proposed to get a partial refund of the money we paid as compensation for the poor cleanliness of the property, the apartment, and the time we had to spend getting the place up to decent status during our vacation. The response from management was that we were trying to blackmail the company, and they sent us a picture saying 'we love all customers - some when they stay, some when they leave'. Nice way to recognise a problem and treat a previous customer!