A picture which came to my mind is a table by the window, armchair in the garden, shelves full of books, and a comfy sofa in a coffee shop. Quite picture perfect!
In reality, what one needs is just reading or writing material that is paper, pencil, mobile, laptop and Mental Sanity. Minimum peace of mind and basic headspace.
People generally read in lone time. So to deal with that either one needs positive place or a positive mind. When we are surrounded by people, we should read personalities as these observations are necessary for any writer.
I think writing is a continuous process. Every piece of writing is either related to our reading or our experiences. We are consciously and subconsciously think about various aspects of almost everything and that comes together in a form of some or the other topic. Writing I think is not absolute Art, it is a mixture of creativity and study.
Here I am not considering fantasy writers. They may need all sort of perfect ambiences for coming up with the ideas that are out of the world. One can explore all sort of windows screensavers may be, they are the best ones.
In general, clear clutter from your head, get clarity in thoughts, have writing material and jot it down. Be it a kitchen counter, bed, toilet, bus, petrol pump, or any queue.

(Image: bookshelf from IKEA)
Thanks to IKEA, this one is good for organized book storage and look. Not sure about seating space though.
