44 Charles Street : a novel / Danielle Steel.

Enhanced descriptions from Syndetics:

A magical transformation takes place in Danielle Steel's luminous new novel: strangers become roommates, roommates become friends, and friends become a family in a turn-of-the-century house in Manhattan's West Village.
 
The plumbing was prone to leaks, the furniture rescued from garage sales. And every square inch was being devotedly restored to its original splendor--even as a relationship fell to pieces. Now Francesca Thayer, newly separated from her lawyer boyfriend Todd, is desperate. The owner of a struggling art gallery, and suddenly the sole mortgage payer on her Greenwich Village townhouse, Francesca does the math and then the unimaginable. She puts out an advertisement for boarders. Soon her house becomes a whole new world.

First comes Eileen, a fresh, pretty L.A. transplant, now a New York City schoolteacher. Then there's Chris, a young father struggling with a troubled ex-wife and the challenge of parenting a seven-year-old son who visits every other weekend. The final tenant is Marya, a celebrated cookbook author hoping to start a new chapter in her life after the death of her husband. As Francesca's art gallery begins to find its footing and Todd moves on to another woman, she discovers that her accidental tenants have become the most important people in her life.

As the roommates bond, and the house fills with the aroma of Marya's exquisite cuisine, there are shadows as well as light. Naïve Eileen explores the precarious boundaries of online dating with a series of strangers. Chris's custody fight for his son escalates to devastating levels. Marya faces an unexpected choice that will take her into untested waters. And Francesca herself will contemplate what had seemed impossible: opening her heart once more.

Over the course of one amazing, unforgettable, ultimately life-changing year, the house at 44 Charles Street fills with laughter, heartbreak, and, always, hope. In the hands of master storyteller Danielle Steel, it's a place those who visit will never want to leave.