The flat is super, -- smart, clean, spacious, well appointed and a real delight. It is in a great position on the Lido, a few minutes walk from the centre (waterbus stop and main drag). There is a bus stop outside which takes a minute to the centre (the way they drive!) with frequent buses. The beach is a few minutes walk through pleasant lanes with great architecture. For us, the Lido was better than staying in Venice -- much quieter , more rural, and everything was within reach by frequent waterbuses. Chiara was totally supportive from the moment I booked and throughout in all ways, even helping us when we got marooned for 4 days at the end by a strike. She well deserves her title of 'super-host'.
We went in late October (half-term): I guess the Lido would be a bit different in the summer -- but still nice. Venice itself was delightfully uncrowded (relatively speaking). We also were gifted with fabulous weather!