I stayed at Bologna for 3 nights, unfortunately I just spent 2 nights at Caterina's apartment since the last days had been fully booked. It is a very clean, designed and comfortable apartment. The best thing is each room has private bathroom, it is really convenient for a single female traveler like me. It's close to the city center and night street (bars), and easy to take a bus or get a taxi. I didn't meet Caterina during my stay, but we talked by phone the last day when I got my luggage. I will definitely stay at the apartment again when I travel to Bologna again.