Louvain-la-Neuve's accommodation problem is nearly as old as the town itself. You can find only one hotel:
Quite expensive, situated in the scientific park of Louvain-la-Neuve, boulevard de Lauzelle: Relais Mercure50â¬-120⬠(http://www.accorhotels.co...).
You can find more hotels in nearby Wavre. More info in french here.
exchange students
If you are going to stay in town for several months, start looking for a place early. Students usually look for flats kots in belgian french/dutch during the months of April and May. Leases usually go from September to September, but shorter deals are possible, especially with Erasmus students. You should normally get help from the university in order to get a room. The center is quite noisy, but close to everything. For students in Sciences and Engineering, Bièreau is the closest district, Bruyères is nice too. For other students, Bruyères, Lauzelle and Hocaille are nice, with lots of students. Some streets are very noisy due to student activity but calm down during exams and holidays. Most noisy months in LLN are September-October and February-March.
Here is a short summary of every district:
Baraque: At the eastern outskirts of the city, this district is mostly residential. Close to the science faculty.
Biéreau: Oldest district of the city, close to the faculty of Sciences and Applied Sciences, lots of students, some residents.
Bruyères: A district built in two parts. The older one is mostly inhabited with students, the newer one is mainly residential. Close to every faculty. Very close from Economics and Political sciences faculties.
Centre: City center, a lot of university and administration buildings, but some student flats, and since 2005, a new range of flats forbidden to students. Close to every faculty, can be very noisy in some part of the year.
Hocaille: On the northwestern slopes leading to the Blocry, this district is a mix between students and inhabitants. Closer to Psychology, Human Sciences and Thelogy faculties. Very close to the sport hall.
Lauzelle: This modern district bordering the Bois de Lauzelle is mostly residential. Far from everything, if something can be far in Louvain-la-Neuve.