This is the 8862nd most frequent Japanese word.
楽々
Effortlessly; easily; comfortably.
Here, '楽々' is used adverbially, describing the effortless manner in which the action (solving the problem) was performed.
彼は楽々と問題を解いた。
He solved the problem easily.
In this sentence, '楽々' is used as an adjective to describe the desired lifestyle, indicating comfort and lack of hardship.
楽々な生活を送りたいです。
I want to live an easygoing life.
The context shows '楽々' used adverbially to describe the ease of the transporting action with the assistance of the elevator.