This was a cute "hate to love" trope.
Kennedy is set up by her good friend Emma with Charlie and though the date (to Kennedy) ends in disaster, she keeps running into Charlie as she moves in into his building.

One of the best parts of this book is "the Ducks" The sweet old women in the building who just want to see sweet Kennedy get a man.... Even if they push her towards Charlie.

The relationship developed very quickly, stopped really quickly, and then got together again very quickly. The power of love and forgiveness I guess.