"La maison est là où est le cœur."
However, this phrase is not commonly used in French. A more idiomatic and natural way to express the same sentiment would be:
"On se sent chez soi là où l'on est aimé."
This translates to: "One feels at home where one is loved."
It captures the essence of the saying "home is where the heart is" in a more poetic and relatable way.