Really enjoyed my stay at Katharina's - Nina was very amenable and friendly despite my very late arrival! The apartment itself was a little cold on the first night, but I blame that more on the weather and the fact that it had been empty all day, by the morning after it was much more pleasant! Apart from that, the apartment was clean, welcoming, the kitchen was very easy to use and I felt at home pretty much from the get go. The location is enviable - west of the centre so it's convenient for the airport yet it's already in the heart of the city - narrow lanes, not a lot of traffic, and the balcony with plants (and sky - which you don't always see a lot of in Bologna!) were also very pretty. I'd happily stay again in Katharina's apartment!