When I stay in the Hannover area, I don't stay in Hannover itself but either in one of 2 other towns ca. 30 mins or so from Hannover Hbf. These two towns are in different directions.
This trip I was close to Hannover, transferred at Hannover Hbf . but I stayed in Hildesheim. Would I do that again ? Yes, since I really didn't have enough time to really explore Hildesheim.
The other town I chose to stay close to Hannover is Minden an der Weser, connected to Hannover by the S-Bahn and regional train as is Hildesheim. Minden is worth your time (ie, a good deal to see) aside from the half-timbered houses especially if you're into history, the "Prussian Museum of Westphalia " is located in Minden, which was a garrison town, have stayed here twice.