Lovely interior, and good food. Food is better than at the Chiang Mai Kitchen, also cheaper, and less busy. The tables have carvings in them, and the ceiling has exposed bars and is quite high in the main "hall". If you get sat near the kitchen, there is a decent freshwater tropical aquarium to watch. The head waiter was happy to talk about it.
The building was originally a chapel for the river boatmen, and the carvings around the restaurant reflect this.