Guilio (the co-host) was really helpfull. I contacted him by mail then by phone messages and he was really quick to answer. He waited for us when we arrived and explain everything very quickly. The place was nice and really clean. You can find whatever you need in this little studio, fridge, dishwasher, washing machin, so you can have a long stay if needed.
If, like me and my sister, you're women travelling, you'll also feel safe with 2 differents doors and then a third lock inside the appartment.
You can reach the central station in 4 minutes (Malpensa express inside or Linate buses outside).
We use to walk so we never took trains, but if that can help you, it goes like 45min to the Duomo, Scala and Galleria Vittorio Emmanuele, 1h20 to Navigli, 1h to L.O.V.E and 1h to Sforza Castle, around 1h20 to The last Supper.
We really enjoyed and we definitly recommand this place.
Have a nice stay in Milan ;)