There was a misunderstanding with Gianfranco. I made the reservation on behalf a friend of mine, but I simply forgot to tell him about this.
When we arrived, I explained that she would be the guest.
Of course Gianfranco was surprised, but he trusted me, and let her stay at his place, even if I seemed not to be correct.
Thank you Gianfranco!
The house is very comfortable, and in a very nice area in Milan.