Today just a link to Youtube. Of course, deluxe sleeper compartments are expensive. And not all of them are of this type. In fact, this is among the nicest compartments you will find on European trains.
Take a look, and if you plan a trip: consider a deluxe sleeper.
Not a fan of night trains? Maybe you can still replace one of your flights by a train trip. How about Berlin – London in first class for 129 Euro?