As they were working, they left the key in a luggage box in a railway station nearby were I had to pay 2 euros. This was absolutely acceptable. What I did not accept is that I had to ask them repeatedly the money back! In my opinion, they autonomously had to think to do that!
Bathroom was not so clean and the mirror was not so useful. I suggest to put a taller one.
To don't know in advance that the bathroom and the apartment were shared is unacceptable.