Maastricht has many pleasant hotels not far away from the Faculty of Law and it will not be difficult to find one yourself. For two hotels we obtained reduced prices.
Next to the Faculty of Law at a distance of 35 mtrs is a charming hotel with the charming name Les Charmes and if you walk on another 100 mtrs you will find the nice historical building of Hotel Au Quartier. These hotels have a total of 26 rooms that have been booked exclusively for the ICCC against reduced prices of € 99 during weekdays and € 120 during weekend days (breakfast for 1 person included in the price for weekdays; tourist tax not included). These are the lowest prices for hotels in the center of Maastricht in April you can get. Referring to the ICCC these rooms can be booked directly (info[at]hotellescharmes[dot]nl and info[at]auquartier[dot]nl).
Links to other not too expensive hotels can be found on the site of Maastricht Law Conferences (first hit when you Google for these words).
For student participants with a low budget, room sharing in the Stayokay hotel is maybe an option (www.stayokay.com), which is also within walking distance of the Faculty of Law. Before booking, you should check with the Student Committee if fellow students in Maastricht offer lodgings against payment of costs for the time of the competition (iccc2018-studcom[at]maastrichtuniversity[dot]nl).