The apartment is quite nice in general. It's clearly owned and operated by a small company that lets out a few similar apartments. It contains all the amenities you'd expect, but not much of the personal touch you'd get when you rent an actual person's place. The location is very close to Biënnale, so if you're looking to go there, this is a nice spot.
Unfortunately, the first day I was there, the heating didn't work. And since this was a particularly cold winter day, it really mattered. I was told that the heating was fully automated, and it would maintain a steady 21C during the daytime. I was also told that no one had ever complained about that. It didn't work like that on the first day, but it was fine the day after I reported it.
Also note that there are additional charges after you book this apartment on Airbnb. There is a regular tourist tax for visiting Venice, and apparently an extra 35 euro "cleaning" surcharge for bringing a small dog.
Last note is that the address listed on the Airbnb reservation is incorrect. Probably a typo. The real address was listed in a series of emails I got from the host outside of the Airbnb messaging system. I reported the address discrepancy, but I was told that I was simply wrong.