I can wholeheartedly recommend the following services, which I have either personally tried or am sufficiently familiar with:

Professional Services

• LK Web Design & Development
• PegusApps
• Chooz Hostess
• RDY Video Production

Cool Stuff

• Lil Café
• Bazaworld.com
• SixPlus 
• Darveniiki
• Krassimira Vassileva Photography
• Martin Krystynek Photography
• Ross Collins Photography

Welness

• Brussels Chiropractic
• Brussels Functional Training
• Massage Giunta
• Haein Yoga & Moving Yogis
• Massoflex
• A Vibrant Life