This was hands-down one of the best Airbnb's that I have stayed in. Nina's flat was both beautiful and comfy and she provided everything that you could possibly need during your stay.
The location is very close to the train station and also close to a very nice shopping area with lots of restaurants. I would caution you to be careful in Bologna after dark, it seems to have some areas that are safer than others and this is near the train station. However, this flat had very good security and I felt very safe. Nina was a very great host and was always available when we had questions and I would definitely recommend to anyone traveling to Bologna!