Not being a backpacker and having lived in Cambodia, that sounds good. I would, however, suggest that reading forums is a good idea, but that people should be cautious about what to believe. If there are dozens of posts across multiple forums, then it may well be a place to avoid. I don't know what is the state of play with Vietnam ESL forums- there was one that shut down a couple of years ago but I don't know what there is now. A friend in Japan says that some posters on forums there have said they make things out to be worse than they are simply to keep the competition for jobs down. I don't know how widespread the practice is.