I 've been in Venice for 3 days with my wife and our 3 daughters, and Alessandra's flat has been a very nice place to stay. It is located in a very quiet area in Venice. We really appreciated to quit the August touristic fury of the city center at the end of the day, and resting in that peaceful and very clean apartment. The location is very convenient. If you wanna walk, you're just next door to Accademia bridge, so you can cross the grand canal quickly. If you wanna have a ride with the Vaporetto, you're just 2 minutes away from the Ca Rezzonico Terminal (served by line 1, 2 and Alilaguna Orange line that deserve the Airport).
As our plane was landing at night, Alessandra has been really helpful with the keys, so we didn't worry about our late arrival. (By the way if you wanna have a mesmerizing arrival in Venice by night, and not afraid to pay for a private watertaxi, I will recommend it. The ride from the airport under the moon light worth it ! It will just drop you at the end of Alessandra's flat street after going down the grand canal. )
A useful detail to know, in the morning, a service will ring the bell of the apartment to bring the trash out if you have any. It could be surprising the first time, but it is convenient.