I was very satisfied with the professional packing & putting into the transporter.
I was dissatisfied with the delay of almost 5 hours at the destination of the move without the drivers could give their approximate time of arrival.
The drivers were barely reachable on their cell phones (short texts with time details that were not met). This meant that no arrangements could be made to arrive at the destination.
Thus, I waited over 4 hours in the meantime even without a mover.
When another appointment around the corner would have to perceive, which I wanted to tell the movers by phone, but then could only inform them by sms, they simply put my furniture (including technical equipment, etc.) on the street with the justification not to work longer than 20 clock, which I can understand. Just not their non-availability to coordinate the arrival.
Furthermore, I have contacted 5 times in 3.5 months about the bill and to date still none received.
Addendum (Oct. 2019).
After 3.5 months comes an invoice for an increased amount (50% more). It unfortunately makes me doubt the professionalism of the company.
For the above reasons in terms of communication and service, I can not recommend OK Removals unfortunately.
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Translation
Comment from OK Umzüge Köln: 
Your OK Removals Team