I had three nice nights at Genovina's place which is very well situated. The room itself is small but well equipped and as a big Terrazzo Lover, I especially loved the floor. I would maybe not choose it for a longer stay (a month f.e.) when I need some more space and also want to cook some meals. But for a short amount of time (and outside eaters) it's a good choice.
Genovina is very friendly and helpful and serves breakfast on the terrace (which I mostly didn't need) which is not free to use apart from this morning hour though (which I didn't know ... I would maybe have used it for some work al fresco). But don't forget that u are living in someone's privat place.
Getting there is quite easy just keep in mind that in Venice there are several Calle del Forno. ;)