Actually, you can book the night trains over the Hungarian Train website (https://www.mavcsoport.hu/en). I am not sure about adding the interrail pass though, as I opted to travel this part without one.
Can you reliably get RENFE seat reservations in the DB app or is it only on paper? That’s great! How do you get them? As far as I know, you can't use the DB app for reservations. But I had absolutely no problem getting the reservations at the ticket counter in the train station.
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