One of the things I loved most about this episode were the dry-erase drawings, although his connection with Anya really got to me for some reason--in a good way. It's fitting that an ex-demon would somewhat befriend a guy that murdered his own friend.
Also, when I watched this episode, it clicked that my newish friend shared a name with Andrew. No lie. At the time, I was in a class with a guy named Andy... last name... Wells! They're nothing alike, besides both being a little off-kilter, but it's still quite interesting.
Back on topic though... Andrew really proves his loyalty to Buffy and the gang, and his scene at the end was one of the most powerful of the season. Buffy's portrayal of redemption has always been a big part of why I adore the series and Andrew's story has been one that I have related too. No, I didn't murder anyone, but sometimes I feel like I've been the catalyst in certain situations with friends, and watching Andrew--especially in Storyteller--has meant a lot to me.
Plus he's just hilarious. The scene in which he "mouths" Anya's words (that sounds dirty?) instead of Xander's reminds me of when I mime along to Anya's part in "I'll Never Tell".