It's sweet, it's well-written, and it's a good mixture of light (in tone) and darkness (in backstory). I'm actually strongly tempted to say it's like Heidi written for romance-minded teenagers. Actually, stuff it - I *will* say that. Grumpy older man? Check. Young girl coming to live with him? Check (although here she's a teenager, not an eight-year-old). Old man learns to open up to others and becomes a better person because of it? Check.