There were so many times I wanted to really like this book, and so many times I nodded along, going yes this is cosy... only to end up tsking at the next sentence with impatience at a bad statement. The author dislikes hygge... a lot.... and takes every opportunity to call it 'elite', too interior-design based and 'trendy'.... when essentially what she is describing as British cosy is proper hygge, free from commercialism, focused on the home, food and friends.
I'd also take issue with the idea of cosy as only a cold weather, winter activity. Getting cosy (like feeling hyggely) is a year round activity. You always need to kick off your shoes, sit back, sip your tea and relax.
Now those points are off my chest, I can tell you the good points of the book.
Cosy is about the small things you do in life to create a comfortable space. It has chapters on tea, clothes, food and crafts. Cosy fits very well with the whole self care approach to life, accepting imperfections, seeking simple and meaningful to us instead of swallowing someone else's way of life in full. I like that: I'm all in favour of finding the ways to hygge that mean most to us. We can be so disheartened comparing our life to that on Insta that we forget to love our lives as they are, warts and all.
If you're already a cosy companion, then the book is a useful reminder to keep life cosy, and the short length makes it a good introduction to making cosiness a part of your life. I couldn't do the full 5 stars only because the elitist view of hygge is wrong.... And I wish she'd met the hyggely people I have, who live happily and cosily without cashmere and wood burning stoves.