There are several hotels, bnb's and airbnb's in the area. Here is a small selection of hotels near the wedding venue.
You can find other options on airbnb and booking.com ;-)
At the heart of a 4 hectare forest, the villa 'Les Trois Fontaines' in Walhain offers 2 guest rooms with a relaxation area (sauna & jacuzzi) in the woods.
Address: Rue des Trois Fontaines 102, 1457 Walhain
The ibis Styles Louvain-la-Neuve is a 3-star hotel located in a green setting, near the city center of Louvain-la-Neuve and the Catholic University of Louvain.
Address: Boulevard de Lauzelle 61, 1348 Ottignies-Louvain-la-Neuve