Trip Hanoi to Sa Pa and back. I booked with A21 Tours our transfer from Hanoi to Sapa and back. They respond quickly to all questions, communication in English is flawless. I payed via PayPal months in advance, and the hotel pickup arrived just in time on the planned date. Great! They send you a reminder via WhatsApp one day before the trip, very nice service. The trip with Eco Tours itself was great on the first journey and below average on the second. I wrote a separate review on Eco Tour Bus. Since the booking and communication with A21 was perfect I rate it 5star.

If you are looking for honest and reliable booking services, this is the agency to use. We used them on 4 occasion, 1 booking had to be canceled on last minute and they gave us credit. 3 other bookings very easy to setup, with quick and excellent Whatsapp communication.
Mike, behind the company, is the best and always do what he says/ writes.
Thank you!

Great Private Transportation in VietNam
I highly recommend using this company for your transportation needs while in Vietnam. We travelled for 2 weeks from North to South Vietnam and used their services for all of our transportation. Airport transfers, Hanoi-Halong bay, Hue, Hoi An, HCMC. Always on time, great communications via WhatsApp, cars are clean and comfy, reasonably priced. We only used for private transport, not tours.

It went like clockwork
A21 were amazing. We used them twice to organise pick up and drop off's between Hanoi and Halong Bay. There and a seven days later back to Hanoi. Communication was fabulous. Coming back was quite complicated because we needed a 2 lift to the airport, from a drop off point in Hanoi,, it was all organised by A21 and went to clockwork. I definitely would use their services again and recommend them to anyone!