!!!SOMEONE BROKE INTO THE APARTMENT AND WE GOT ROBBED!!!
The door couldn't be locked from outside nor inside, it was only possible to shut the door.
Although there were 2 different locks, we were only provided with one key for one (unsafe) lock. I specifically asked Francesca if the door could be locked and she said no and that it is safe to stay in her apartment. The next day when we went outside and got home again someone broke into the apartment and stole our stuff! Afterwards we tried to open the door without a key on our own and indeed the door could be opened without a key and only with force pushing the door!!
This place is really not safe to stay and we are happy that no one was injured.