The apartment itself is really spacious - plenty of room to move around and, importantly for us, to hang laundry to dry and still have room to move. The apartment is very comfortable and is in a good location. The apartment is pretty well stocked with pots, pans, etc. However, if you are a light sleeper, the cars going by in the early evening are loud as the tires go over the cobbled road and people walk by right by the window. We didn't find this too bad, but just be aware. This is an apartment in a part of the city that people live and work, so it is to be expected.
Sallupo was really easy to communicate with. We arrived late due to a train delay and he was quick to respond with a restaurant that would still be open. Check in was easy and he sent all required information on time.
A 10-20 minutes walking will get you to either the lower or upper city and it is close to the #1 bus line. If you like art, the apartment is about 10 minutes from the Accademia Carrara Museum, which has a fabulous collection of Italian art. The walk to the upper city (Citta Alta) is uphill, but not bad, and certainly beautiful. Bergamo is a beautiful city and well worth exploring.