The apartment is really nice and clean. The beds are very comfortable and we particularly enjoyed our room (nr 3). Across the street, there's a really delicious restaurant (Vite Rossa) and a supermarket 2 minutes away. The bus stop is also very close and getting to Piazzale Roma from there is rather 15-20 minutes, though in the description and in other reviews it was written 10 minutes. It's still very easy to get to the island.
We were a bit confused about this city tax and only looked up the information after we had already paid 32 euros for two people for 4 nights. Lucano said it was 4€/night/person. But in an article on allaboutvenice: http://allaboutvenice.com/venice-tourist-tax/
it says it's 3 euros per person/day. Here it also says if you have a Venezia Unica card, you don't need to pay it at all. And we bought a 3-day pass, so actually we shouldn't have paid anything.
He also took pictures of our IDs as he said that he needs to fill in this about every visitor. He didn't really mention this beforehand and it happened really quickly. The next day we asked him to delete the photos of our IDs as it's against the new GDPR legislation. If you need to have the number of the ID, you could just write it down instead of photographing it. We loved the stay there but we think other people should be better informed about these things.