Vienna–Bucarest night train: romantic or bad idea?

I would like to use the Dacia Express to avoid a flight and earn a night during a European route. I travel alone and take a bunk, not the seat. I read opposite stories about cleaning, delays and border controls; I would also arrive in Bucharest in the morning with the backpack. I am interested in understanding whether rest is acceptable and how to manage documents, values and a possible long delay. I'm interested. above all a comparison based on recent experiences: indicated travel period, what really worked and w…