The Dutch justifiably pride themselves for their excellent English-speaking skills, and it's certainly helpful to new arrivals who have no knowledge of the Dutch language. While this makes things easier, you may find you want to learn the local lingo, and it will help you integrate better into Dutch society. It will also save you from typing up those Dutch letters you receive into Google Translate. The University runs Dutch courses that the Observatory will part subsides (~75%). You can find out more by clicking here. The Dutch 1 classes book up fairly quickly, so be sure to register well in-advance.