This is the 13044th most frequent Russian word.
маленькое
"Small" or "little."
Here, 'маленькое' describes the noun 'счастье' (happiness) signifying that the amount or extent is noticeably small.
У нее маленькое счастье.
She has little happiness.
In this case, 'маленькое' modifies the noun 'желание' (desire), emphasizing its modest or minimal nature.
У него есть маленькое желание.
He has a small desire.
Here, 'маленькое' is used with the noun 'дом' (house) to indicate its physical dimensions are small.