by train:
to Hamburg-Hauptbahnhof (or Dammtor-Bahnhof), then take the S-Bahn S21 in the direction of Pinneberg to the Eidelstedt stop, continue on the same platform with the A1 train to the Burgwedel stop. The journey takes about 26 minutes - from there 600m walk.
Alternatively, you can take S3 via Landungsbrücken and Altona to the Eidelstedt stop and then take the A1. Since the A1 drives less frequently than the S-Bahn, you may have to. wait a bit for your connection in Eidelstedt; the travel time will be extended accordingly.