If I could give any advice to future interrailers it would be, just don't night trains! It is not economical spending a night on the floor of a carriage in 35c being thrown around as a train accelerates and breaks furiously across the entirety of Germany. To top it off sometimes you are awoken throughout the night by a guard shouting to look at your documents. Don't do it. However, leaving Amsterdam on the train, as the sun was setting was rather nice.