I'm moving back to my mum's for a few months soon and trying to think of the least annoying window blackout option.
She has good thick curtains but they are the kind with eyes/rings which go directly onto a pole, so the waves in the curtain let the light in. She also has net curtains on a wire rod thing right on the frame.
I don't think a roller blind will work as it's too intrusive (requiring screws).
So what are the options? What do you have and does it work for you?