Yes, I too think this is the best idea.
I hated sharing my space too {apart from with the lovely 18 yr old student} but I needed a Lodger after a divorce, @lodger needs hers after a bereavement, which may be psychologically much harder.
Sharing a bathroom and a kitchen is hard.
People who are lucky enough to have a separate bathroom and kitchen for lodger to use are so lucky, bit most aren't like that.
One other story.... Single parent had a young lad move in at 18, like I did.
One night, her lodger came back completely out of it and she thought he was on some sort of drug, as he was vomiting and 'not masking sense'
She was very angry as had a disabled daughter in the same house.
Next morning, she checked on him, and he was worse.
She called an ambulance, as couldn't risk having someone that out of it in the house.
Except it wasn't drugs.
He ended up in Intensive care for weeks on end with meningitis.
They said the landlady had saved his life, had she not called the ambulance, she'd have come home from work to a likely dead young man.
He was too ill to carry on his uni studies, and his parents were so grateful to her.