This is a Gem! We spent 4 days in Venice with our 6 year old. The location is perfect. Very close to a water bus stop, about a 7 minute walk to the Rialto bridge and market.
The apartment has lovely high ceilings and is very comfortable with a lovely kitchen if you feel inclined.
We walked everywhere only getting a return ware bus to the airport. If that's not what you want there are plenty of gondolas close by and the water bus/ taxi stop close by.
St Marks is about a 15 minute slow walk away with some lovely Restuarant's within a few minutes.
Victoria arranged to meet us and was very accommodating.
As I said this is a Gem, perfectly situated to explore Venice.