I come to Bergamo quite often to visit a friend. I have stayed at Simone's City Walls guest-house several times and plan to return again many times. It is spotlessly clean, with a very comfortable bed, a big shower with plenty of hot water, excellent WI-FI, and modern conveniences such as night table lights that are activated by touch.
There is a laundry and coffee bar one block away, an Aldi's Supermarket two blocks away, and an excellent restaurant, the Ristorante La Carbonella two blocks away. This restaurant offers an incredibly low-priced special for lunch on Mondays through Fridays.