I would definitely recommend the attic! :)
We haven't met Odile, but she was really kind and precise to explain us everything about the house and how to get there. The location was perfect, we could go everywhere from there. We were five and we all loved the apartment, the only thing i would say is that the kitchen wasn't very equipped, no colander or basic spices (only salt and oil, but hidden in the closet, we had to look for them), and especially no rubbish bags, apart from the one already in the bin. We discovered it only the night before to leave and we didn't know how to throw away the trash, and in venice they seem really precise about garbage collection. Anyway, we managed the situation, this is just an advice also because we felt a bit sorry to leave around some stuff that we couldn't throw away. Thank you Odile!