I recently stayed at Cannaregio Particular, which is not a hotel at all. It’s not an apartment either, it’s a tiny room slightly wider than your bed, which is also not a bed, but a reclining folding cod for young lightweight sportsmen. There is no space to get on your sleeping place from the sides… so, just imagine two fat aging persons, trying to lay down through the leg-end of the bed. And for the full picture you should know, that the bed has a metallic rim (mattress holder) at the leg-end. No problem to crawl over it, problem is to sit on it, because there is no other place to sit! The only chair in the room is occupied by your suitcase, and if a couple have another suitcase… then… you have an additional problem.
You also should know that your room belongs not to you, but to a horde of mosquitos, given you as a plaque, who bit you viciously on the first night. Then you obviously go to the war and leave bloody spots on walls and sheets (I have pictures!)
There is no staff; you have a phone number to call in case… What case? To change a furniture or mosquitos? You just enjoy Venice and your location, which is the only good quality of your place.