I grew up in a town smaller than 50K. I really enjoy being away from noise, having a garden, birds singing and telling me it's 5am after a night of coding :3
I can really see myself living in a big city like London, especially while younger -- especially when single, there's so much in terms of entertainment.
I am concerned about noise levels... I used to sleep anywhere, but I noticed I'm becoming fussy so dunno if i could sleep in an area where there's noise 24/7.