[Like he said before, it won't be too hard to find him -- after all, asking where the qunari's staying in the inn points to only one person, in the end.
He's waiting patiently in his room - he's got enough to do even if Dorian doesn't show up. He's in the middle of writing a letter to his boys, brief notes about what he's found out about this place so far, just from general, absent observations]
[But yes, the door's unlocked. Maybe poor decision making in a town with lots of vampires and hunters. But then, he can take pretty good care of himself. He's fought enough vampires in the past, and he's got pretty thick skin.]