Do you believe in love at the first bite? I think you should, as it does exist.
We went here last December, just a couple of days before we left Chiang Mai. And we clearly understand what the fuss is all about.
Before we got to Chiang Mai, I did a little research about where to have nice desserts there (because, I just had to!). This place came up a couple of times and I read a lot of good reviews about it on TripAdvisor, Foursquare, Facebook, and even on some random site.