We spent one month at the place, enough to feel it like home. :)
We loved the apartment immediately, even bigger than our needs, but it was handy to have so much space given we had lots of baggage. Cozy and clean and we loved the bookshelf fool of books!
Only little issue, the water heater shut down by itself sometimes and had to be restarted. Nothing serious, it's a few secs fix and it's expected when you have a gas powered water heater. And probably we noticed it because we stayed for so long in the place. The hosts say they will fix it after we left.
The hosts are super-nice, quick and attentive to all needs.
And the location is good, public transportation close and you are also near the northern exit of Milan and the train station. Can't be better than this.
We definitely consider coming back to the place when we come back to Milan in the future.