Positives: The location is as it says - very close to St. Mark's square, which is great. The aircon is also pleasing, and there is a tiny elevator (a rare thing in Venice), which is good to take luggage up to the first floor. Wifi is available, though very average.
Negatives: Unfortunately, the cold shower tap does not work. The tap was turned on and off, and literally no water comes out of the tap. As only the hot tap works and the water runs **extremely** hot, it made it impossible to shower. Therefore, I had to revert to washing myself by filling up the kettle with water and bringing it into the bathroom to pour on myself. This is ridiculous -- at the very least, I should be expected to be able to shower. As I didn't check in until the evening (6:00pm), I didn't discover this problem until quite late, and too late to contact my host. When I did report the problem later, my host offered no apology, simply saying that I should have told them straightaway. However, I didn't have a shower upon check-in, so it was impossible to discover the problem until later. It should be THEIR job to ensure that everything works properly before a guest checks in.
On another small note, I was told to travel via public boat and my host would meet me at the San Marco Giardinetti boat/ water taxi stop. When I arrived, my host suddenly had no knowledge of saying that they would meet me, and instead directed me to walk to Bar Americano to meet someone. I made several texts and a phone call at quite an expense as I are using an Australian phone to rectify this. After talking to my host about this, they dismissed this point, saying that they didn't recall our conversation, and me walking to the bar to meet them would make check-in easier as the apartment was just around the corner.
This is extremely disappointing and frustrating, especially because your apartment came highly reviewed by other users, and I paid quite an expensive sum of money to stay there.
Overall, whilst the location was excellent, this was a very disappointing use of Airbnb.