Chang Thai House has been recommended to me by a friend who is also a picky traveler and the hotel is indeed fantastic. Chang Thai House is on a decent location, not too far from the towns; walking distance approximately 10 minutes. You can take either Songteaw (red taxi) or Tuktuk to Nimman road for 100 to 150 THB respectively. It's also 15 to 20 minutes from the airport.
The room is lovely, clean and spacious. Some flaws are there is no closet, the water pressure at the shower is not that strong, and the water doesn't drain fast. The room also is full of amenities. In addition, the breakfast they serve is good and variety. However, their restaurant doesn't offer lunch and dinner.
The staff are friendly and helpful. I had a massage and it was great. The trip they recommended for me to do was very interesting. Check-in was very quick, I am happy they gave me an early check-in for free.
In general, this is a nice hotel. I will definitely come back with my friends. Thank you for all the staff and the accommodation. I will be very pleased to stay there again.