Marta is a nice host. She helped us find a taxi for our early flight. Although the price is quite big for only 6km (is not her fault) she facilitated the transfer to the airport, so big like for her. She gave us good tips about Bergamo.
About the room: We didn't stay too much in the apartment to have a full experience. The apartment looks clean. Being close to the train station allows you to get faster to Milano or other places.
The inconvenience is that you'll hear pretty much all the noise from trains and cars outside or in the building, where worth to be mentioned are located some other bnb's as well.
It is ok for one night, wouldn't opt out for more.