The appartment in Bergamo Città Alta is perfectly located - right in the center of the old town, yet not directly on the busy streets.
Also, it is very close to the only real (micro) grocery store, where you can get all the basics you may need (food, washing stuff etc.).
The appartment itself is very spacious and has bedding for around 5 people (with one bed up high, which might be fun for the younger!) and the style is very nice, with high ceiling and partially unpainted stone walls, which give it all a very rustic, yet polished feel.
Can only recommend - 10/10!