1.
any place becomes home once you live there
Literally 'if you live there, it is the capital.' However unpromising a place seems at first, one grows to love it after living there.
住めば都だよ。
You'll love it once you live there.
都 is the capital, standing for the most desirable place to live.
Usage
Often said to reassure someone moving somewhere new, or looking back on a move that turned out well. It describes getting used to a place, not the place being good in itself.