Not quite a tip, but 3 days ago got "stung" at the Phousi 1 Guesthouse in Luang Prabang. Our original rooms bookings were US$20 a night, down from US$25 a night because we were not interested in the breakfast. What a surprise then when checking out after 5 days, that the room rate was suddenly US$30 a night. After complaining, they explained we could have the room for US$25 as indeed we had not had any breakfasts, and that the reason for the higher tariff was that we had been given the wrong room & had stayed in a more expensive room - so had to pay more. Not impressed at all! We reluctantly paid up, but in Luang Prabang make sure you avoid the Phousi 1 guesthouse, or if you do stay there - pay in advance when you check in, so that there are no touch ups & scamming.