My fiancee and I were here for one night. The check-in process isn't the most convenient because it isn't at the apartment. We did not arrive at Milano Centrale, so we had to arrive at the check-in location before heading over to the apartment. If you plan on having heavy bags, I do not recommend this.
The apartment was very stylish and is located pretty close to the Milano Centrale Station. There are a few food options nearby if you arrive hungry. :)