A great address in Venice !
Location: five-star location, spot on in the centre, a few minutes walk to San Marco, a supermarket, many restaurants and historical buildings. The instructions provided when you book are very clear, so getting to the apartment from the Alilaguna/vaporetto stop was easy and fast, even at nighttime.
Check-in: We were allowed to self check-in on the first night since our flight landed quite late, and the process worked very well. The later "real" check-in took a few minutes and was easily scheduled.
Communication: was almost instantaneous during the whole trip. Upon check-in we had a very nice and informative chat about things to do in the area, restaurants, insider tips, etc.
The apartment itself is very clean and spacious, with 5 confortable beds (one double) and a kitchen, which is ideal if you're traveling in numbers and/or want to self cater.
The bathroom was also clean, the shower hot and toiletries and towels were provided.
There's a total of 5 short flights of stairs (2 floors) to get to the apartment so it's easier if your luggage isn't too cumbersome.
There's also the option to store your luggage in the building if you're leaving in the afternoon or evening (if you ask in advance).
The excellent location helped me have a great time in Venice with my family, so do not hesitate to book.