We spend in Flavio's apartment 5 nights and it was really nice experience. Flat is situated in calm neighbourhood, but just 50 metres from bus stop - you can easy get into old city (bus 3, last stop is inside old town, citta alta) and bus number 6 to cita bessa and train station. So in 15 minutes (or less) you are wherever you want :) Near flat you can find some shops, pizzeria and small bar with nice coffee :)
In addition, we were with small, still crawling baby, so we were focused on level of cleanliness and we can't complain at all at this thing :) Everything was really clean!
We have really good contact with Flavio, and he was very helpful all the time when we were in Bergamo.
Nice thing - kitchen is equipped some wines, beers and groceries in market's prices. So if you don't want to shop in one day - you don't need to! :P
To sum up - I recommend this flat in 100% :)