For someone like me who is not the biggest fan of horrors, I watched this on a whim. I must say it was brilliant.
Cusak plays a supurb roll, and more of his character is revealed through the story and you get to understand why he goes round these 'haunted' rooms and writes about them.
The room itself is horrific. A few good jumpy bits and the scene in the vent was scary as hell. I wont spoil it, but I wont be stayin in a hotel for a while...
Buy it, or at best rent it as you are missing a great film.