Home sweet home
Definition 1 of 1
Pro Tip 1/3Emotional Expression
Conveys your deep emotional attachment to your home as a safe and comfortable space. 
Stepping inside, she sighed with relief, 'Ah, home sweet home.'
Pro Tip 2/3Irony Usage
Sometimes used ironically when the home situation is less than perfect. 
He noted the leaky faucet and chuckled, 'Home sweet home.'
Pro Tip 3/3Colloquial Tone
It's used in casual conversation; not suitable for formal writing. 
Back from college, Mia exclaimed, 'Home sweet home!'