My wife and I took on a food tour, 2 day Halong Bay and a Trang An tour. Everything was organised quickly and exactly as promised.
In particular our tour guides for the food tour (Edward) and the Trang An tour (Chuong) were amazing: very knowledgeable, hospitable and had fantastic command of English.
I would highly recommend Eviva Tour, and suggest it's worth paying that little bit extra.