I got that impression too. Not that there's any place where Jack can truly be safe, but he clearly flipped his switch from sad to cheerful when he stepped inside. I could easily see him treasuring the occasional quiet moment alone there without having to put up with anyone else, especially just after getting bullied by Rusty.
Also, I wonder if Dan is human. He doesn't have any of the known shapeshifter signals (odd hair, eyes, tongue, etc), and his speech bubbles are just basic black on white.