Apart from the earnings, what attracts Jo to Aunt March's house in Little Women?

In addition to earning money, Jo, deep down, likes her "peppery" old aunt, despite often quarreling with her. However, a chief attraction for Jo in going to Aunt March's house is the library.
Jo loves to read. Her aunt's library (once the domain of Jo's uncle, who has since died) is large and filled with fine old books. It contains cozy chairs and globes: it is a comfortable, little-used room. For Jo, it is "bliss" to be able to go there.
Whenever Aunt March takes a nap or has company, Jo has a chance to escape to the library and "devour" books: adventures, romances, poetry books, travel books, history books, and more. The only problem is that, inevitably, she will hear her aunt's voice calling her back to work.