Justine and her place were fantastic with an exception of the effectiveness of the air conditioning. If air conditioning is an important amenity to you, I would consider what I have to say below. If not, you will be very satisfied with your stay.
The location is very central and walking distance to many attractions, restaurants, and shops. A grocery is moments away. Should you wish to pay for a private taxi, a marina is less than one minute walk to the front door.
The place itself is very clean and recently renovated. We loved the way it was decorated. Her TV is awesome and the internet is fast and reliable. All her appliances are Boch. I couldn't have designed a better modern haven in Venice. Justine also left us some butter and jam for breakfast and she had coffee available.
That being said, this listing stated there is air conditioning. However, there wasn't a built in Air Conditioner but a portable AC Unit that can only cool one room at a time and is very noisy to sleep next to. You had to aim the exhaust hose outside a window, so that permitted foot traffic noise to be heard in the unit in the morning that you would otherwise not hear with the windows closed. There was a very powerful fan for our use, too, but it does not effectively replace air conditioning in Venice July heat. All other Air BNB (including Italy) places I've stayed at with air conditioning are able to maintain standard room temperature throughout the flat. The place was very nice but we wouldn't have stayed there during these summer months (+30 degrees) if we had known the state of the air conditioning situation. I hate to give a negative comment to such a nice place, but it made an otherwise perfect stay, a little restless at night with the heat.