I can highly recommend Keller GmbH as a cleaning firm. I had used another firm for 3 years prior and was never satisfied as they only did a surface cleaning, never stayed the entire time I was paying for. With the Keller team, they always clean very thoroughly, are flexible and I really appreciate that Verene, the boss in charge, comes to make sure the staff is doing a good job. Thus, there is accountability. They are very proactive , hardworking , trustworthy and kind. I highly recommend them.

Carina Santos Quirijns, October 2015