We stayed only one night at Khampone Guesthouse, which is a small hotel, not a guest house. The staff is helpful, the rooms minimalistic and relatively comfortable, but the place is quite noisy and feels like it's going downhill. That said, that's the case for most of Vang Vieng. At least, this place is a little out of the very noisy heart of town, yet a very easy walk.
The wifi does not reach most rooms.