The apartment is well located, in a more quiet side of Venice. It has everything for a small trip, we stayed 8 nights and even cooked sometimes - as there is a small plate for cooking and some utensils as a pan and a pot. You can easily walk in Venice, and you should, as the vaporetto is really expensive (7,50 € for 75 min). The famous Piazza San Marco is 15 min by foot and also other beautiful places which you can explore by foot.
The apartment was not really clean, it was a little dusty when we arrived and as there is no vacuum it became dustier within our stay. But when we arrived, we were warmly welcomed by Marina, who showed us the way, and we think this is necessary, because the apartment is in a small street, which you alone wouldn't find :) The Wifi is not really good, videos do not load and you need a lot of patience to wait for websites to load.
The pictures show a really good impression, the apartment is just like on the pictures. But do not forget, that in Venice there are a lot of really small streets, so the apartment is not very light, but as you'll explore Venice, you won't stay in the apartment. :)