Accommodation
You can find a map of the venues and the hotels offered by Hotel Service Utrecht here.
Besides Hotel Service Utrecht, you can find plenty of opportunities to stay in Utrecht, via AirBnB, a nice Bed&Breakfast, or one of the lovely boutique hotels. Public transport in and around Utrecht is easy and very good. The central train and bus station is only a 8-minute walking from the central event location, which is the Main Library (Bibliotheek Utrecht, Neude 11).