Personally, I think that 123Fahrschule is an excellent driving school. I had the theory completely through within 3 weeks, as many lessons are offered at different times. The theory lessons at the Holweide location were super explained, practical and anything but dry! Before the practice I had a huge fear, however, I was in pretty good hands with my driving instructor Dennis Gerhards. His calmness was contagious, so I quickly lost my fear. He is really ideal for people who are very insecure and anxious to begin with. He explained the driving tasks all in a structured and sensible way and he has a good assessment of his learner drivers and knows exactly when they are ready for the test.
The driving school itself is super digital and someone is always available to answer questions. Overall recommendable!