I had an excellent stay at the apartment near Parco Sempione. The location is excellent, very close to metro, tram etc. You step up from the building and the park is right outside, Parco sempione is the largest green space in Milan.
Simona is an excellent host, she provided me with all the necessary information before checking in. She is also very accommodating and helpful. The apartment is well set up with everything you would need during a short stay, and it is perfect for families with small kids. There are many books and many toys that would keep your kids busy during the stay!