I can recommend Giuliano’s BnB.
The room is very clean and AC and shower work great. The mattress very comfortable (knowing from experience it’s not always the case in Italy).
I slept very well (despite some voices in the little ally which is close to a piazza. Most people will not even realize them though).
Communication with the owners was very smooth and I could store my bags on the departure day !
It’s location is very close to Piazza San Marco for those who want to be in a touristic area. I found it nice to be so close to the laguna , but for having food and coffee I went elsewhere for a more “authentic” experience. I would return to this Airbnb though bc being able to sleep well at night in a cool dark room with a good bed is priceless for me on travels.
Thank you !