Just returned from a few days in Venice. Stayed at 3C Bed & Breakfast, based on comments already on Tripadvisor. The accommodation is very good and the room was a good size for Venice. Breakfast was excellent. Fabio is a very pleasant and helpful host and always willing to chat. He gave us good recommendations for eating. The location is great if you want to get to St Mark's Square easily. Although this part of Venice is quite expensive it is nice to walk around and see all the shops. We actually got a lovely mask very close by and it was nice to see the lady painting the Masks in the window of the shop, some are also signed by her, if you go out of the B&B and turn left, walk to the bottom and the shop is just over on the right before the bridge. Certainly worth a look if you want an authentic Venetian Mask.
We would certainly stay at 3C again as Fabio is very nice and the facility is perfect for a short visit to venice. If you have experienced trying to negotiate Venice with a suitcase you would certainly benefit from this place in terms of distance from the Vaporetta Stop.
The rooms are big enough to spend time in. We had one wet day and so bought our lunch and ate in the room.