To live simply, you don't have to be Amish, or a monk in a cave ( I am neither) ....you just have to be yourself, content, not pressured by what society tells you you have to have in order to fit in.
You can live in the city, in an apartment, or in the country. You just have to be content to live without the need to impress or the need to reward yourself with things and stuff, that ends up ruling you somehow. We have chosen long ago to not buy into the hype about having to have what the Jones' have. I can stay out of the stores and walk in the morning in the fresh air and have so much more than what can be paid for.