We were 4 adults and we had the best experience with Rudy's Taxi. Rudy and his wife Katja are both experienced tour guides. Day 1 was with Katja giving us a walking tour of the city and she gave us so much information in a friendly way and also made us taste local snacks on the way like Herring and eel. She did not rush us and we felt like we were with a friend.
Next day Rudy drove us through the countryside in his luxurious Mercedes van and we stopped and strolled through many little villages, then went to Markem a beautiful fishing village, we also stopped at dairy farm, wooden shoe factory, Edam, Volendam, Gouda, ka Steel de Haar, Delft, Monikerdam, Nijmegen and the windmills. All in the next two days, driven once by Rudy and once by Katja. On the day we were to board our ship, Rudy picked us up from our hotel and dropped us off at the port even though we asked him to do this last minute.
They are also multilingual and spoke fluent English as well as German and Portuguese. Highly recommend Rudy's Taxi to anyone visiting Amsterdam.