We advise you to book an accommodation as soon as possible. The following hotels will offer a preferential rate for this event.
Hotel Ibis Leiden Center - mention "University Leiden" (79 euro per night)
Tulip Inn - registration code 221726 (86,83 euro per night)
Golden Tulip Inn - registration code 221726 (107,52 euro per night)
However, there are several other options in the city centre and at walking distance from the workshop venue (including several AB&B options).