Way back in the early 2000's I heard about a Thai restaurant named Koh Phangan in Södermalm, Stockholm. Rumor had it that it was quite good.
It was. I can therefore happily inform anyone in Uppsala that Koh Phangan has expanded to their town. It's just as good as the old one in Södermalm - with the same colorful interior as the photo below shows:
This battery of Christmas lights works best at night, but even at mid-day you'll find that they put out enough light to be a significant factor of the interior. The food is good, albeit a bit tame compared to newer Thai restaurants.