They'd have to have lots of windows for me, as I just like to see things outside when I'm writing or doing stuff. Also a garden large enough to serve as pasture for a couple of sheep, chicken and ducks - or actually, they could all graze on the roof, couldn't they? How awesome would that be?
What would really be great is if individual holes could be connected to form a warren - or, to use the proper word, a smial.