Andrea is a great host with strong attention to detail. He does the little things to make you feel welcome, and spends a little time with you upon arrival to make sure you're comfortable with the apartment and getting around Bergamo. He's also easy to get a hold of if you need anything.
I had a pleasant stay, and as noted in the comments, the 4/5 stars is because of the noise at night in the surrounding area that kept me awake, but I only stayed for one night. Everything in the apartment and dealing with Andrea was excellent.