I work in an open-plan office and it's the most miserable thing in the world, even with headphones. After this I will never again accept a job without a private office.
If I ever have another company, if I can't afford the office space, I don't need the person. Office space is cheap compared to salary and wasted productivity.
I was miserable working by myself in a private office.
Life is better now I work from home. It's better to have the kids screaming in the background than people tapping your shoulder and blasting your entire thought process out of the window.