Hello and thanks for your answer.
We did this long time ago and it worked untill now.
Unfortunately now AirBnB and Italian tax authorities require that the person entitled for the Ad is the same phisical person that then declares the income for tax purposes: this forces us to have my mother as "the host" and me as the co-host otherwise I will be accountable for the taxes related for my mother's revenues.
I guess if there is someone from AirBnB that can look into this and give us a solution to transfer the Ad, I think I wouldn't be the only one needing such functionality to be implemented in italy.
For what regards the reviews hiding behaviour you described, we have the exact opposite requirement: we would like to keep all the good reviews we had in the past also after transfer.