Martina is a lovely person and a great host and I can warmly recommend staying in her place. Communication with her was very easy and she was always ready to help out when I had any questions or concerns.
Martina's apartment is bigger than it looks in the pictures, it's very comfortable and also has a nice little balcony where we enjoyed our morning coffee and evening drinks. Nice bedrooms and great bathrooms, and the living room is comfortable for four people.
We were travelling with my elderly parents, so the lift in the building was very handy. Reaching città alta was a bit difficult for my parents as they could not climb the steps next to the Accademia Carrara Museum, but for me and my husband this was no problem. You can catch the number 1 bus at the top of steps (next to the university) to go up to the old town and to enjoy the famous Bergamo walls. I was attending an academic conference so for me the location was perfect.
There are some nice bars and a couple of restaurants nearby, as well as a lovely cheese shop and a fruit shop. In addition, next door to the tabacchi (where you can buy the bus tickets) is a lovely gelateria with super friendly staff and a great selection of ice creams - we had one every day! :) There is a supermarket and ATM on one of the side streets just across the road (where you find the bars in the evening), so the location is pretty convenient.
It does get a bit loud at night with the road just outside the bedrooms, but I still slept through the night, but something to consider if you are a very light sleeper (bring earplugs and you'll be fine).
I would gladly stay here again and explore Bergamo some more, it is also convenient to park a hire car nearby as we did, but you can also move about easily using the bus, which we also did.