I took the NIghtjet from Munich to Bologna last July in a private cabin. It was all very comfy, I loved having a private bathroom and it included evening snacks and a light breakfast. I did not sleep well even though it was comfortable and quiet, due to the intervening stops and knowing that I had to be off that train at 5 in Bologna. I did enjoy a hot shower before arrival though.
15 years ago, my family and I took an older night train from Venice to Paris. Although we had the couchette cabin all to ourselves, the bathroom was on the hallway and disgusting by morning. The train pulled over for hours and turned the. Ventilation off. We were up all night choking in the heat. I swore never again…but a cabin is a different game.
I thought that maybe next time I would just go through to Rome, so I could sleep later without the early morning wake-up stress. Not sure it would matter much, but I’d give it another go. I think it can be a nice experience, but not a great night’s sleep…so you have to decide what matters more to you.