Awful, we just ran away and cancelled our stay. When we enter the apartment, there was a mouse alive in the sink just in front of us. We found lots of dirts, stains and mouse excrements on the sofa. Then ants, and dead bugs at other places in the apartment, so even if it was already late in the night, we decided to just go find another place to spend the night !
I would really not recommend you not to stay there because all of this got us a lot of doubts about how often this apartment is cleaned. And reading previous comments, stains seem to be there since a while.
Also even if we stayed there just a couple of minutes, the neighboor upstairs was very loud