Conclusion first: Everything was just fine and its the perfect location for exploring Venice.
We stayed there for a week and we had no trouble. The apartment was very clean. Modern facility and everything you need to cook your own meals was there (beside a sharp knife for chopping vegetables^^). Its also a small but cosy apartment which is no problen cause you dont want to stay inside when there is such a beautiful city to explore. Your like 2min away of the famous San Markus plaza and therr is also a supermarket right there. Very central s you can explore and shop and show up in the apartment to drop something and to continue your day.
10/10