After booking the Giardini B&B the owner, Roberto, contacted me to tell me that it was already booked so he offered me another apartment near the B&B. We arrived at 1h00 a.m. and he wait for us to give us the keys of the apartment and go there with us. We thank you very much for that. The apartment has everything you should need (heating, tv, kitchen stuff, kettle, toaster, ...... even a washing machine).
Close to apartment there is also anything you need (supermarkets, restaurants, all kind of shops, pubs, etc..). There is a vapporetto station at 3 minutes walk.
If I ever come back to Venice I will definitely try to book that apartment again!!
Thank you very much Roberto!!