I will soon ride towards Bucharest from Austria using the Dacia Express train, on Vienna to Bucharest route.
The usual expert sources (seat61) deliver valuable info; anyway, I still have doubts on the following points:
The trip is pretty long as the train leaves around 7pm and arrives at 3pm the next day. So far, I could understand that a cafe car is attached to the train for the Romanian portion of the trip. Are international credit cards or cash in Euros accepted? This can be useful to know if going to the currency exchange office beforehand is needed.
Do the sleeping cars have showers at car ends? I booked a regular bed in a 3-berth room, unlike deluxe compartments which have en-suite bathrooms. Using the ÖBB booking system, I only had choice between 3-person and single occupancy, with no mention of standard/deluxe or 2-person possibilities as it is usual in sleeping cars.
Lastly: the train crosses two borders. I heard stories, that happened a few years ago, of passengers waking up at odd hours as requested by armed officers for passport checks. Is it still the case today?