Lucy Kellaway, writer for the Financial Times says, well at least the Globe and Mail headline does: "Working in a coffee shop is a real buzzkill."
As a rule I do light reading and writing in a coffee house (the hip term) and not heavy duty stuff. I don't try to read books on philosophy in my local cuppa, that's for sure; or edit and rewrite more formal pieces.
Yes, it is well documented that Harry Potter scribe J.K. Rowling wrote her first H.P. novel in her "local".
Whatever works for you. I'd try and write in a metal foundry if it increased my chances of having J.K.R. quantities of money.
I'm off to my local coffee shop; or, I could travel for a few minutes to Jet Fuel Coffee Shop on Parliament Street. It's a hipster place and one which generates some buzz....
Working in a coffee shop is a real buzzkill