Jaap was everything one could hope for. Before the tour he communicated frequently and easily. Our plans to meet were straightforward and flexible. For instance, we were traveling with our young adult sons and didn't want the day to be too long, so we modified the tour to fit our needs. The day of the tour we found him to be so friendly and kind. His knowledge of the Groningen area is unmatched. He put together a tour for us that was so thorough, interesting, and fun. But most of all, we were so impressed with the historical and genealogical work he did to supplement and complement our existing information. What a great tour and what a great man.