When they leave for vacation they check in at the trainstation
The travellers board the train
In the room inside the train, the traveller unpacks his suitcase and gets acclimated
The train travels to different cities during the night, and stops for a few days to let the travellers explore the town when they arrive in the morning
Because the travellers sleep in the same room every night, they don't suffer from first night effect and always have a good night rest