The flat is very close to the central station. Getting the keys is very easy (if your phone works and lets you call the required number to open the main door the first time).
The flat is warm, comfortable, with the basic stuff required for a short stay. No noise from the street or the neighbors.
A supermarket just across the street (and a post office). Within distance walk from everything interesting in Milan (or if you prefer taking the metro, the station is very close to the building).