I visited Venice with a family of 7 for 1 night. This apartment could not have been located in a better place. Extremely close to the Rialto water bus stop (there are 3 different stops - be very careful which water bus you select). Approximately 20 minute water bus from the Venezia Train Station. The apartment is ~10 minute walk from the main attraction, San Marco piazza and the water bus stops there that take you to the colorful islands of Torcello, Murano, and Burano (Highly recommend checking them out). The shopping area is ~5 minute walk with plenty of high-end/mid-end stores, restaurants, bars, and local shops.
The apartment overall is amazing with almost all amenities available (Wasn't aware of the Tourist tax). High speed wifi, wine glasses, almost all kitchen appliances were available. We cooked in the apartment since we had been eating pizza for the last week just to get some change and it was amazing. The apartment is clean and tidy with plenty of towels and linens available.
Downsides: The biggest downside to this place is that there is an elevator but you cannot use it. I showed up at the main entrance with 6 of my guests (2 of them kids) and 6 big heavy bags and was told we could not use the elevator. It was extremely disappointing and tiring getting the bags up almost 2.5 floors (apartment is located between 2nd and 3rd floor - American standards). If you do not have heavy luggage, this is a perfect place for you.
Overall, Cristina is extremely helpful and responsive through the app. The location is unbeatable and so is the price.