It was a perfekt stay, many thanks to Andrea and Nicola. I didn't see Andrea, only Nicola, who was very friendly and showed everything at the house (doors of the beautiful old lift should be always closed, especially when leaving!)), told about good places around the apartment and answered all our questions.
The apartment is located just 15 minutes walk from Milano Centrale station. From the station you can take a very comfortable train to Venice (2,5 hours), Komo or Bergamo (around 50 minutes with a regular train), Monza (12 minutes) and so on.
If I return to Milano, I would stay in this apartment again.