Iryna provided detailed descriptions on how to get to the apartment. You have to travel by boat (vaporetto) from Piazalla Roma station or Marco Polo airport. It's only a ten minute walk from the nearest vaporetto station. The apartment is kind of tucked away in a dark, dead-end alley; there are no views of the city. But the close-by Campo Santi Giovanni e Paulo is beautiful and a good place to just sit down and relax. From the apartment you reach San Marco square in around 10-12 minute walk.
The apartment itself is wonderfully renovated and best suitable for 2-3 persons. The kitchen (good but not first class quality) and bathroom have everything you need. From the smaller (second) bedroom there is noise disturbance from people living right above on the first floor.
There is a bakery, Coop supermarket close by as well as a very good pizzeria! The famous bookstore Libreria Aqua Alta is just a couple of minutes walk from the apartment.