Most of my close friends rent and live in fairly modest sized homes and apartments. Many share spaces with roommates, partners, husbands/wives, wayward hobos, and such. Yet even those of us who choose to live in smaller spaces in urban, population-dense areas often dream of having "just a little more room". Personally, I want a few more hundred square feet for a proper dining room and a larger kitchen (our kitchen accommodates only one person at a time), but we get by fine well enough. But who doesn't want maybe just a smidgen more storage?
How much is enough? What would you consider sufficient: not an extravagant amount of living space, but enough that you'd feel like you have enough space for you, your partner/family, and your possessions? Any reasoning and opinions in specific are welcome too!