More literal translations:
* Nid d'amour: This literally translates to "love nest" and is often used in a playful, romantic context.
* Gîte amoureux: This translates to "love retreat" and might be used for a secluded cottage or cabin.
More figurative expressions:
* Leur petit coin de paradis: This means "their little corner of paradise" and emphasizes the feeling of happiness and intimacy.
* Leur refuge: This translates to "their refuge" and focuses on the safety and privacy of the place.
* L'endroit où ils s'aiment: This literally means "the place where they love each other" and emphasizes the emotional bond of the couple.
Ultimately, the best phrase depends on the specific situation and the tone you want to convey.