We stayed at the YMCA International House for 1 night because we thought that it was closest to the airport (still a 15 minutes drive). For discovering Chiang Rai it's not the right location as it is quite far from the city center.
The room was okay (not great) at first sight, but the beds are so hard it's almost impossible to sleep on. At night the room appeared to be full of insects and other crawling things.
On the positive side, the hotel has an outdoor pool which is nice after a hot day. Furthermore, the staff was very friendly and brought us to the airport very early in the morning.