Long term rent in Alsace

[Red Devil]

My family and I are due to move to Mulhouse within the next 6 to 8 weeks. We've been searching the internet trying to find agencies who provide long term rental leases, but without success. Ideally we're trying to find a 3 to 4 bedroom house (typical family type) within a 5 to 10 mile radius of Mulhouse.

Is it a case of approaching the local immobilier for such details?

It's a long shot, but does anyone know of an organisation who provides this service?

Hope you can help, thanks.