I think it would look much nicerMy husband works night shift, so yeahI'm not going to spend tons of money on curtains that we might not know if they will fit at the next apartment.
It will help some, but not as much as you thinkThat paper is inside the roomWhatever light it absorbs is released into the room as heatOnly the light reflected, (typically less than 50%), would be rejected heatThe darker the paper, the less heat rejectedYou'd do a lot better with aluminum foil.(~90% rejection.).
