How do I get from Milan's city center to MXP at 4 o'clock in the morning? Thank you!
It would be wise to stay at a hotel at airport location.
There are many.
Sorry to be nosy, but why do you need to be at the airport at 4 am?
www.malpensashuttle.it shows bus departures from Milano Centrale FS at 3:45, 4:00, 5:00 and every 20 minutes thereafter.
The Malpensa shuttle bus takes one hour from Milano Centrale to MXP. Doesn't sound like it leaves early enough for you. As noted by the previous poster, if you really must be at the airport at 4am, you should stay at an airport hotel. Is the airport even open at 4am?