We've never lived there, it was the much loved home of some family members and has more recently been rented out.
Have you inherited the house or are you helping your relative to sell it?
I'd advise them to not update anything costly!
When my nan moved to a carehome, her house needed TLC like this one, but was certainly livable as it was. We got mixed advice from the real estate agents on whether to update certain 'bits' including re-painting. My very pushy aunt decided that re-painting the entire house was needed.
My elderly mum and aunt 'helped' a bit, but I did the bulk of re-painting the house around my full time job. In hindsight, it was the most wasted 2mths of my life! I very much doubt the cost of the paint and materials alone were recouped, let alone my own time and effort or spending every weekend and many evenings there!
Yes clean, tidy and give it more kerb appeal, but I would absolutely not be thinking of painting over wood, replacing the kitchen etc etc.