Giovanna's place is right off the water bus station Arsenale - which is 2 stops away from San Marco. San Marco is a 10 min walk away and the area is more residential and private.
We were welcomed by Danilo and Cristina as Giovanna was out of town, and they were so kind to offer for us to store our luggage and get early check-in. They also recommended some restaurants in the area.
The unit is impeccable and very clean. All the furniture and finishings were modern and freshly renovated less than a year ago. It is very spacious and great for a small family or couples. There was even a washer for dirty clothing. Giovanna was very easy to contact via WhatsApp, but we didn't need much since they provided everything for us readily available in the unit.
I would recommend this place to anyone visiting Venice :)