go big or go home, black reach B)
Imagine there being a quest where you have to clear out Black Reach of all the Chaurus (get rid of all eggs too) and Falmer, so that people scared of the dragons could move it. That'd be pretty badass that place becoming one, big, city later in the MQ, and then the majority of people returning to the surface later, with some deciding to stay for good. =P
Personally though, I'd like a nice, warm, cozy log cabin deep in the forest. A big log fence around a wide proximity to keep the wildlife out, along with an automated gate. Perhaps a portcullis? Also maybe 4 guard towers, small ones, at each corner of the fence. All the smithing equipment out front, stables for horses. Inside all of the things I'd need. Enchanting altar, Alchemy lab, mannequins, weapon racks/plaques, etc. =] You know what, [censored] it. I might as well just request my own damn castle lol.