Me and my partner just spend one night at Renato's place and it was wonderful. On the first place, we arrived late as I misunderstood the time of arrival and the check-in hour. He showed pretty understanding and welcomed us warmly at his home. Our room was huge, with a comfortable mattress and plenty of space for the luggage and clothes. Everything was clean and tidy, and the apartment smelled very nice. Very well connected with both the station and the città alta. Renato himself was helpful and kind, and I totally recommend his house for staying in Bergamo.