Wiktionary
home away from home
n. (context idiomatic English) A place in which one is as comfortable as one's actual home.
WordNet
home away from home
n. a place where you are just as comfortable and content as if you were home [syn: home from home]
Usage examples of "home away from home".
Spice Jaxx's was their home away from home, a hushed, low-lit jewel box in the center of the spice market vibrating with the heady scents of cinnamon, pepper, and wer-mace that so moved them.