What a wonderful tour! April-May is the time to go, as the weather is improving (we had many days in the mid-20s Celsius after a cool beginning), and the Keukenhof Gardens are open and, in our case, were included in the tour. Our wonderful tour director, Philip Orna, went out of his way to ensure we had the best tour possible, and our driver, Ludwig,
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There were a few downsides. The accommodation in Bruges is a brand new Radisson, which is still teething, is understaffed and is not well located (next to the rail yards). Apparently chosen by Insight because they received a lot of bad feedback regarding the previous hotel.
The NH hotel in Amsterdam is also new to Insight, and is very tired. It is apparently due to be renovated this year (2019), so should be in good shape by 2020, but may not be so good this year.
The Chateau D'Urspelt is lovely, but it is a true country stay. It is a long drive from Luxembourg, so those who choose not to take the optional excursion to Trier will have to remain in Luxembourg until the excursion returns. Trier is certainly worthwhile, so we would recommend taking this excursion.
We went on the majority of the optional excursions and recommend doing the same. We thoroughly enjoyed the tour and made many friends among our travelling companions.