Birthday party venue for rent

Does anyone know if in Brussels I can find a venue to rent in order to make a birthday party for 20-30 people? Ideally I would just like to rent a place where I could bring my own food/alcohol and be able to connect an ipod or something to have the music play..An alternative could be a nice bar which could offer a separate venue and good deal on drinks (so in short having private and place separate from the crowd is a must). Thank you in advance for any advice!

Veli