Well, of course she could have given him just any of the free rooms, but he didn't look or smell all that confident and comfortable, so maybe he wouldn't want to be very far from Raphasel? They seemed close after all.

"Then how about a room that's just diagonally across from Raphael's room?"

Room 102 was the closest free room to Raphael's (and also directly across from her own room, but the young man didn't seem like she would mind having him there).