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Nikhef, Science Park 105 1098 XG, Amsterdam. There are direct train connections from Schiphol Amsterdam Airport (30 min, 4 times per hour). For travel information and directions: http://www.nikhef.nl/en/about-nikhef/contact/how-to-reach-nikhef/
To use public transport, you can buy the all-in-one Amsterdam Travel Ticket (multi-lingual page) (3 days for 25 Eur, including the trip from the airport) or use regular public transport chipcard ("OV Chipkaart") options. Remember to always check in and check out again when using public transport in the Netherlands.
Amsterdam has plenty of accommodation, both in the centre and close to Nikhef and the Science Park. Some suggestions can be found on on the Map and can be booked either directly or through a booking agency such as booking.com.
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