We spent five days at Andrea's place and it was a lovely experience. The palazzo is just as described and showed in the pictures, an old and almost dilapidated building, but quite charming. We got earlier than expected and the room wasn't ready yet so Andrea told us to leave the luggage and come back later but he was fast fixing everything and at midday the room was cool: a little bare and plain, with one big bed, shelves, and a table with chairs. The window had views to the patio. It was quite clean (taking into account that is an old place).
New people was always coming and going from the rooms but they were very respectful and we can't complain at all. I was a little afraid because of the shared kitchen and bathroom but most of the time the building was quiet and we were almost alone so no problem. The kitchen was fully equipped (we felt free to use whatever we needed) and even Andrea provided us with yummy biscuits for breakfast.
The location is really good (supermarkets and lots of restaurants nearby), like 15 minutes by walking from the station and perfect for a nice walk to Città Alta: other 15 minutes to the funicolare and I would say 40 minutes if you prefer to go up by walking. Andrea took his time to give us a map and explain some tips about the city.
I highly recommend this place if you're visiting Bergamo.