I'm thinking of taking the Berlin to Budapest EuroNight "Metropol" train later in the year. There are two fares for a 1-person berth on the DB website: "one person in economy single berth" and "one person in deluxe single berth". I can't find any information about the differences between the berths. Also, nothing about what is included (e.g. breakfast). The difference is only 20, but seems a waste to pay extra when an economy berth would be perfectly adequate.