Nadatheo is a strange guy - He clearly knowns the Borah district and lives there, but Joli senses there's more to him than he lets on. She doesn't know much about his backstory aside the fact that he often stays as Jon's pub.
She does think she knows what's important though. Nada is a good person with a good heart. He's trustworthy and others speaks well of him. He will hide or save anyone in need, not to mention provide emotional support. So, when Joli is over her head and can't help someone out, she can often count on Nada for help, if she can find him.