Hi Ms Sunny,
I had an amazing time. Phuong and Kinh were great guides and cooks. It was very well organised and the homestays were a special experience. Great trekking as well. I was sad to finish! You were very helpful too :)
In terms of improvements the only thing would be to tell (European especially) Trekkers that it could be very hot and to bring a good sun hat, and lots of water. Remind them to make sure they stock up with water at each shop they pass.
Send me a link if you want me to write something on trip advisor or your website!