Why does Jim enjoy having Ántonia working in their house?

From the text:

Each morning, while the dew was still on the grass, Ántonia went with me up to the garden to get early vegetables for dinner. Grandmother made her wear a sunbonnet, but as soon as we reached the garden she threw it on the grass and let her hair fly in the breeze. I remember how, as we bent over the pea-vines, beads of perspiration used to gather on her upper lip like a little mustache.

“Oh, better I like to work out of doors than in a house!” she used to sing joyfully. “I not care that your grandmother say it makes me like a man. I like to be like a man.” She would toss her head and ask me to feel the muscles swell in her brown arm.

We were glad to have her in the house. She was so gay and responsive that one did not mind her heavy, running step, or her clattery way with pans. Grandmother was in high spirits during the weeks that Ántonia worked for us.