Finished the DLC, still need to finish the main game though. It was peak, some of the highest high ever reached by FromSoftware. Tough but exciting boss fights, great atmosphere enhanced by masterful soundtracks, especially the ones composed by Nobuyoshi Suzuki and Yuta Kitamura. A great revisiting of previously seen areas with new angles showing us intriguing elements of lore, while still not entirely clear, made me shiver or frightened at times, especially the laboratory.
I'll probably write on the game as whole when I'm done with it.