We had a wonderful time at this beautiful apartment with a large terrace overlooking the Grand Canal near the Rialto Bridge. A staff member met us at the closest vaparetto stop and walked us to the unit and gave us the basic information we needed. The wifi worked well and was very fast (with a slight bit of dropoff in the farthest reaches of the huge apartment). If you can navigate the vaporetti routes you are close enough to reach anything you want to see while being far enough away from San Marco to avoid the worst of the daytripper crowds.
Note: The owner informed me a few days before arrival that the apartment that I originally booked had a plumbing issue, and offered this larger one as a substitute for my original booking price. It was much larger than we needed for 2 people, but we appreciated the extra bathroom. I can't really evaluate this unit's value proposition because I don't know what this unit's listing price is. I think the unit would work very well for a family with children, but personally I would be reluctant to rent this for 2 couples because of the huge disparity between the huge master bedroom (which has a view of the Tower in Piazza San Marco and direct access to the terrace overlooking the Grand Canal) and the other smaller bedrooms (which have neither).