Chiang Mai, Thailand. It's super cheap and has a ton of 'digital nomads' there. I didn't spend too much time doing that there but there were a few co-working spaces, at least a couple years ago.
Why not ? You should check Niman area. Lot of coffee shop where writers and other artists likes de hangout. As said a lot of remote workers are living here. I know some people working for big US tech companies living here.
