Katharina's apartment is great. Nina and Antonella were very helpful with letting me in and showing me around the flat, and flexible with check-in/out.
Location is spot on with plenty to see and do within a short walk. The apartment is lovely and quiet despite being so central.
It did get quite warm inside (but it was July so everywhere in Bologna was warm!), but Katharina made sure I was aware of this before she accepted the booking. There were also a couple of fans which helped ease the heat.
Katharina has also put together a very comprehensive guide to the city for her guests which was very helpful indeed.
All in all a fantastic stay and good value!