For the transportation:

The bus and the train go to different stations.

The Malpensa Express train goes to Cadorna Station. From there, you would take the Metro about three stops to the Duomo station, which IIRC is the best station for the Park Hyatt.

The express busses go to Statzione Centrale. From there, you would take the Metro about four stops to the same Duomo station as above.

The train is listed at 34 minutes on its timetable, while the busses take 50 to 60 minutes in non-rush-hour traffic.