I’ll recommend to read rules of apartment carefully, because there is a tax for late check in. We paid 50€ for coming at ~11:30 pm, what I think is overpriced while we didn’t live half of the day at the apartment and paid more then a half in addition. The reason of why we have so late check-in is late arrival, so I couldn’t change this.
Despite all above the apartment is great - clean, warm and there is a lot of space. 5 min to metro, the same line as Duomo, easy to get to the QC Termemilano by 10-15 min walking.