We generally research listings very carefully before committing, but somehow we missed the fact that this apartment doesn't have a living room. The only common space is the kitchen. Since we stayed for a week, this was a bit of a disappointment to us, but it was fine.
The flat is very clean. The bedding and linens are all nice and clean. The rooms aren't big-- one is especially small if you have the bed opened as a double -- but they were nice. It was great to have 2 big bathrooms, and the clothes washer.
I'm not sure why the listing starts out touting a "private gardener and private garden", because the only "garden" we could find was a few potted plants in the dark lobby, and directly outside the lobby. There's no private outdoor space of any kind-- not a balcony, etc.
Also, note that it's not a "few minutes walk" to Brera or Navigli. Per Google maps, those would be 30 and 60 minutes, respectively. But the flat is a short walk to the Chinatown area, which has tons of great restaurants and was super fun for New Years Eve. And the trams are nearby, which are a great way to get around. (Metro is close, too.)
One other thing to note-- we were only provided one house/building key. Since the flat is in an apartment building, you need the keys to enter a front gate to the property, a door to the building, and then the apartment door. Without a second key, the family had to all exit and enter the apartment at the same time. Ex: if one person goes to get groceries, the others can't leave because they can't lock up; the group can't split up to go sight-seeing, unless you give the key to those who arrive home first, and they will come back down to the entry to let in the others. It would be really great to have more than one key, especially since the flat is promoting that it sleeps 6 people. For families with older kids and business travelers, they may want more freedom of movement.
I would say the best things about this flat were the cleanliness, and the location to Chinatown.