Hello Kitty Café is an interesting place. It's aesthetically pleasing - ok, extremely adorable - and has desserts and drinks on offer to match.
Every opportunity to incorporate Hello Kitty is exploited: think Hello Kitty shaped cakes, Hello Kitty drinking glasses, Hello Kitty coffee art, and Hello Kitty bow embellishments. Yes, it's a bit of a novelty, but the visual appeal of the menu items (already fantastic) don't hinge on it.
In the era of the artisan café, it's nice to have somewhere a little kitsch open up. The only downside is the desserts: they look beautiful, but the taste didn't quite measure up. On the upside, the drinks were as nice as they looked.