I stayed here for two nights with a woman friend. We selected it based on good reviews in trip advisor and because it was very reasonably priced in very expensive Venice. In short, our room was very nice, totally modernized bathroom and the breakfast was very good and plentiful.
The location was perfect -- near San Marco so very easy to find from the Vaporetto stop and, after wandering all over Venice and getting delightfully lost, we were always glad to find our way back to 3 C with no problem. The owner was there each day and was so helpful and considerate. Highly recommend if you are a budget traveller or just want a great value.