The apartment is great. It is literally 2 mins from St Mark's Square. It is in a very good location and super quiet and safe. You get the keys to the place and the door is very secure. It's in a rustic Venetian building between canals.
My GF was worried about cleanliness but she was really happy when she entered. Inside is very modern. The bathroom is big. Loads of towels and shower stuff were provided. WIFI and Aircon worked perfectly. The bed is a fold-out sofa bed and it is enormous. The kitchen is clean and has everything you need for preparing meals and drinks.
The bin is quite small so if you plan on cooking and disposing of stuff, you might need to bag it and after a few days, find a public bin somewhere.
When you enter the building, it may be quite dark. There is a switch behind the door that illuminates the stairway up to your apartment.
I think lastly, getting back to the place will be a challenge as the layout of Venice is labyrinthian. Keep a few landmarks in mind so you don't get lost!
The host was very good at explaining everything to us - Restaurant recommendations, local culture, places to visit etc. She replied really quickly and endeavored to make us feel comfortable.