I am also trying to find out what a piece of piano music is. It is used quite often during really sad bits of films and TV dramas. Can remember it used during a film/programme where someone is looking out of an upstairs window over the snow outside. It is classical music, a little similar to Moonlight Sonata, but much slower with sort of intermittent piano keys being played.
Sorry if this is a bit vague but any help would be much appreciated.
Your description certainly seems to suggest his style so if this isn't the one, perhaps try searching Einaudi on YouTube to see if it might be one of his other compositions.