• take the Bus&fly shuttle directly to Ferrara.
or
• take the Aerobus to the Bologna Central Train Station and then a train to Ferrara.

Trains to Ferrara are quite frequent (direction: Venezia).
Please check the timetable on Trenitalia.

Google maps:
Hotel Ferrara, Largo Castello, Ferrara, FE - ITALY

A map of Ferrara is available here.