Chiang Khan is certainly popular with Thai tourists and justifiably so. It can be reached by a flight and bus combo from AirAsia or a do it yourself version with NokAir and a 1 hr Song Teow ride.
There are apparently bans on development which helps the township retain the charm of low rise wooden houses along the river frontage. Many older houses have been converted in to Home Stays, offering simple rooms with shared facilities at prices much higher than any other place I’ve visited in Thailand.
Some places, particularly with a river view, can be quite expensive but cheaper accommodation and river view dining can still be found at very reasonable prices.
This is the view from the Riverside cafe run by Sri Pan Homestay. Nice views and a very reasonably priced menu.