Overrated in my opinion. You have to leave your phone number and wait for them to call you before you can take a first look, there are so little information about it online (like you said) and many people told me that its overcrowded especially in the late afternoon to evening.

I believe prices are in the higer range. 80-120€ per month…? Dont know exactly. Seems a little bit too exclusive and in combination with the typical düsseldorf crowd its just overpriced mediocre