The description of the arrangement as a "COVID safe private apartment sealed off from 2 upstairs floors" is not accurate. The stairways up and down from the "private" area are not sealed by anything except some symbolic obstacles. I could clearly hear everything going on in what I assume was the kitchen at the top of the stairs, and on occasion smell what the hosts were cooking.
Also, at least 3 times during my stay, the hosts had to enter the "private" floor to gather something from another room, and the two times when I was there to see it, they weren't wearing masks. So if you're sensitive about COVID risk and don't want to be in a space where strangers are breathing, this is not the listing for you.
However, everything else about my stay was absolutely delightful. I've rarely found an Airbnb so well appointed and thoughtfully furnished. The room was nicer than my own bedroom at home, and I was completely comfortable there. The location was easy to get to and near great restaurants and a park with amazing views of the city. An easy 5 stars if it weren't for the misleading listing text.