I'm the original poster looking to visit Bologna (3 people) in October and I thank you for your recommendations. What a journey! I've tried AirBnB, VRBO, TripAdvisor and Booking.com and also the apts suggested above (not available darn it) It is the strangest thing I've seen. when seeking an apartment. if I search for what I thought would be a standard apartment: 2 BRs, requesting smokefree, 2 beds (not a sofa or pull out), a kitchen, a living room, and internet in Bologna....the number of postings is small for Bologna. And what there are, don't have good comments.
There are more options if I leave out "living room" but then I get postings that have either no living room at all, or a small combo area (usually with seating consisting of a kitchen table for 2 and a small couch for 2 people). With 3 people travelling, that is not workable. Has never been a problem anywhere else. When I read the reviews, although the scores look good, the comments are frequently not great at all. ie the apt is on the 6th floor no lift. Or smoking is not permitted in apt but ok on the balcony. Or the apartment has no windows---at all. Or the apartment is so noisy that no one could sleep, or that if the windows were open no one could sleep and when they were closed no one could sleep due to warmth. Oh my.
There is no convention in town, and we are 6 months out, so I guess the lesson is to start earlier. If anyone has any other suggestions for booking sites or 2 BR apts, don't be shy, I'd love to take a look. Happy travel planning to all.