On Police-on-web, you can request police surveillance of your home during your vacation/holidays or in case you are away.

https://policeonweb.belgium.be/eloket/selectComplaintTypeAndAuthentication.action?lang=fr

If you are temporarily away from your home, on vacation, Mutapost Holidays suggests three solutions for the transfer of your mail.

- your mail can be forwarded to another address

- your mail can be forwarded to a post office (po) box

- your mail can be kept in a post office

http://www.bpost.be/site/fr/residential/letters-cards/absence-move/mutapost_holiday.html

Do you wish to have someone maintain/look after your garden in order not to find a jungle on your return ?

Consult the many small ads on :

http://www.quefaire.be/annonces/jardinier-405,1.php4

To have someone look after your cat or your dog the nearest possible to Brussels ?

Pento at Overijse :

http://www.pento.be/en/home

Another animal, like a bird, a fish, a hamster ... a teenager proposes to take care of them (board).

http://www.quefaire.be/annonces/je-garde-tout-vos-animaux-1525412_100.shtml