Most of the articles we read on such things are about downsizing and simplifying leading to happiness, but you might find some stuff here:
http://www.apartmenttherapy.com/main...s+on+happiness
We read this site pretty religiously. It's pretty niche, as it's about living in small spaces, but it likely has some quotes you can use about living in a well-maintained place that reflects your personality versus constantly trying to upgrade to something larger and newer.