Not been on that sleeper train, but used one last year to travel from Budapest to Zurich.
We compared flight and hotel Vs the overnight train which made it more attractive.
Is doing the trip during the day an option? I would expect the journey to be scenic in places.
I never sleep as well on a train, so if you need your sleep like my good lady it might not be the best option.
Either way sounds like a great trip.
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