We were staying for 2 nights with 3 kids. The apartment is very spacious with 3 bedrooms. Entrance is from a tiny street, one bathroom downstairs and the 3 bedrooms upstairs with 1 additional bathroom and a kitchen/dining room.
To be honest the pictures are selling the place. In reality the rooms are not that much filled with sunshine (which should be normal in downtown Venice). Also some repainting would fit very well to the place, I guess the pictures has been taken long time ago when the apartment was remodelled last time. Location is perfect but windows are very closed to the neighbours (which is also normal in Venice but might bother some, especially noises during late or early hours like vacuum cleaning we experienced at 10pm).
As the price we paid at Maria's place (500 EUR per night in July) is comparable with hotel prices with better standards and quality, I would prefer to stay in a hotel next time.