If you arrive by train from Milano Centrale:
Take the Yellow underground/subway line to the Piazza Repubblica stop (also within walking distance, 300 meters). From there, take the S1 line towards Saronno, and get off at Novate. (ETA: 30′)
Take the Green underground/subway line to Cadorna. From there, take the S3 line towards Saronno, and get off at Novate. (ETA: 40′)
Take the Yellow underground/subway line, and get off at Comasina. From there, take Bus 89 to Novate, and get off at the “Via Matteotti / Via Cavour” stop (300 meters from us).