Part 3. Quite a lot has been written about PTT and BKK, I'll tell you about the island of Koh Chang. We lived on White Sand Beach. The options for hotels are the sea, you will not be left without housing.
Part 2. Living in BKK. Hotel White Palace (There is a swimming pool on the roof, nearby are all shopping centers, etc. ) $40 per room per night, with breakfast. The hotel is old, but you can live.