My private cabin was a first-class Single Sleeper, four to four-and-a half-feet wide, similar to but in my opinion somewhat more comfortable than, the roomettes offered by America’s passenger railroads in the 1950-1980 era. It contained adequate but not generous luggage space, and, thanks to a unique interior wall configuration, a washbasin and toilet that could be used without lifting the bed.
There were bedrooms for couples or families travelling first-class.
The multi-berthed tourist sleeping compartments looked crowded and cramped to me and I’d recommend them only for persons with serious budget constraints.