Accommodation on the Lido is much quieter than in Venice. The public beach is about a 10-minute walk away, as well as a vaporetto stop. And we did this with a 4 years old child. Even though it was end of September, we used the veranda with a view to the green garden. There is everything in the kitchen, we did not waste anything. The second bedroom is small, when the couch is used as a bed, but it was enough for the kids, especially when they had a big TV :-)
It was our first experience with airbnb accommodation and we were very surprised.