I have been in contact with Kamps Wohnkonzept since June 2021 to rent a 3 room apartment in Aachen and I found all the staff friendly, very helpful, and kind. If you are a foreigner and need to rent an apartment in Aachen, you'll definitely need to check with Kamps Wohnkonzept as all the staff speaks very good English and are helpful in all aspects. Moreover, problems, applications, or requests of any kind related to your apartment are dealt with promptly and unbureaucratically.
My small family and I are very satisfied with the service by Kamps Wohnkonzept and we highly recommend the company as an excellent landlord.