I wish we stayed here first. We stayed in another bungalow in Pai that was pretty run down, not realizing at the time how bad it was.
Pai Loess has the best bungalows you could hope for. Clean, spacious, and ours even had its own private toilet, sink, and shower. The owner/manager is super nice and friendly, and they sell big beers for only 60baht (711 price). It's a great location next to a farm, with beautiful views of the farm and mountains. It's nice and quiet because it's across the river from the main Street, but still very close, and easy to walk across.
The only negative is that the up high places were dusty/dirty, but I've seen that everywhere. Thai people are short, I'm tall, so I see all the places they miss cleaning.
The only other negative, you will get in any bungalow due to their nature of being open aired. You will get the odd mosquitoes, ants, and maybe even a spider or cockroach, but that's what the bug net is for!