Great location, and spacious apartment for a couple and child.
The location is excellent - we got the ferry from the airport which was about 54 euros return for the three of us (children under a certain age are free). It was around a 10 minute walk from the F.te Nove ferry terminal to the apartment so it was pretty convenient. We walked everywhere during our 4 night stay - San Marco and Rialto are a short walk away and there are plenty of bars, churches, restaurants and shops on the way so you are still very much in the heart of things. The apartment is next door to a Coop supermarket which is well stocked and surprisingly cheap, there are also some cafes and restaurants in the the square plus a take-away pasta place called Baci&Pasta which was good and useful when our 2 year old wasn't feeling well one evening.
Air conditioning worked well in the living room and bedroom so the apartment was very comfortable whilst it was very hot outside. The TV has HDMI so we brought a FireStick which entertained our little one whilst we were getting ready in the morning (and us when he was asleep!). There isn't any outside space but there are nice big windows overlooking the square so one evening we opened them wide and pulled up a couple of chairs and got some sunshine over a beer and took in some of the atmosphere of the square.
The apartment has pretty much anything you would need and the kitchen was very clean, with a large fridge/freezer, cooker, dishwasher and washing machine.
The only minor issues were the shower water pressure was pretty weak and the electrics occasionally tripped in the kitchen which meant a walk downstairs to flick the switch back on. Neither issue was particularly detrimental to our stay and we would certainly stay there again.