I really enjoyed my time at Oliviero's. He was very helpful prior to the trip and during the check-in, as well as on my last day in Bergamo when I left my belongings at his palce while visiting the city (after check out).
The place is comfortable for 1 or 2 people on a short stay and I loved the are where it is located. Since it is in the old town, at night it can get a bit loud outside and this might not be the best for a light sleeper, but I had no issues. It was clean and tidy. Overall, recommended!