Hannover Hbf (central station) is located in the centre of Hannover. There exist direct train connections to many national and international train stations. Examples given:
Leipzig ➞ Hannover via ICE
Hannover can be reached in east-west direction traveling the highway A2
(Dortmund – Hannover – Berlin) and in north-south direction it is well connected by the highway A7 (Hamburg – Hannover – Ulm)
Hannover Airport (external link)
Every 30 minutes local train line S5 (direction Paderborn Hbf) takes you to Hannover central station (duration 17 minutes). A single ticket costs 4.30 €.