Roma, still

My hotel room faces inward, looking down on the small courtyard and across to buildings that are not the hotel. From my window I can just see the corner of a room in a house or apartment across the courtyard. It seems to be a library or study since the wall is covered in messy overstuffed bookshelves. In front of the books there is a desk. When evening comes someone in the house turns on the green bankers lamp on the desk and sits working. From my angle I cannot see the person in the desk. I see only a hand that holds a cigarette and the smoke that curls in front of the shadows on the wall. The hand pauses to turn the page in a book and then returns to hold the glowing stick. Who is this who sits late at night as the smoke curls into the air?