Ren typically refuses to do any business in person, but this particular client has the potential to open up a new market and a reputation for petty revenge that makes Ren wary of alienating him. Besides, in this particular instance an in person meeting will save weeks or months of effort and Ren appreciates the value of time.
She's aware of the war of course, and aware of the web of treaties and promises of aid that could easily pull her own nation into the fight. However, she's not aware of the bomb, no one is, and she has no idea how little time it will take for the world to end.
She arrives in the generic hotel room, nice enough not to be embarrassing to her client, cheap enough not to draw unwanted attention, and sets down her bag. She doesn't bother to unpack. She'll only be here for two days.