The OP has to think what he wants. And what he needs. Apparently the OP is looking for a more or less remote place to get some work done. Maybe the OP doesn't mean remote, but just means quiet. 'Deepest and darkest rural Cambodia' is not very specific.

For me living with a family would not be productive. If I wanted heaps of work done in a certain amount of time I would rent a decent house in some small town connected to grid, hire a cleaner / shopper / cook to take care of the shopping, the cleaning and the three mails a day, and start working. I'd also buy a heavy safe, attach it to some concrete in the house, and use it to store my valuables like laptop, bank cards, cash and stuff. I would consider taking a dog, although raising one takes months and I am not sure the OP has that amount of time. A fenced garden coupled to one or two dogs increase the safety quite a lot though. And dogs are loyal as fuck.

I would look for a house with a nice working space. Shaded, but open. Preferably on the top floor, at the edge of town, so there are some views to admire. There must be literately thousands of places like this scattered around Cambodia, but you'd have to do some field work to find them.