Don't hesitate to book this place, it's awesome! My suggestions is to read reviews first as you can pick up plenty useful infos. Even for Rose, Gold or Petite as they're in the same building.
The Coop is the bigger supermarket with better bakery, the best way is to get off at Palanca if you're already on a vaporetto and there is a restaurant with the same name Palanca and next to it there is a small alley way. Go along and on your right you will find the supermarket.
At the post office which is on your left along the water front when you leave the apartment, you'll find an atm which doesn't charge and Revolut card works fine.
Definately buy an unlimited vaporetto card for your trip and make sure you go out at night to enjoy the ride. Best place to sit is at the back as less windy than the front.
Hope you have a wonderful trip as ours was. Enjoy!