Silvia's apartment is spacious. There's 8 of us so we booked the studio room as well. The beds were a little too soft for us but all in all the apartment was great. Nice kitchen, good wifi connection. It is around 750m away from Bologna Centrale train station, you can easily take a bus if you are lazy to walk, just 2 bus stops. And just 350m walk to the nearest bus stop to get to city center too for those who doesn't want to walk too much. Silvia gave great suggestions on food and attractions too.
Would definitely recommend this for big groups of 5-8.
Thanks again Silvia!