* Are the linens good quality, or should I bring an extra blanket/pillow?
Linens OK blanket is thin, Ask for extra pillow and/or blanket early if you want one

* Is the sound insulation pretty good, so I wouldn't have to worry about loud neighbors?
Sound insulation is adequate unless you have loud neighbors if you do tell attendant and problem will end immediately

* Do the curtains block out light (from stations) pretty well?
Very well

Tell us Are you in a roomette or bedroom and its number?

The roomettes near the end of the car tend to be noisier than the ones in the middle
A) because of the wheels
B) because of the doors
C) coffee pot across from one of the roomettes

Same might be said of certain bedrooms