Visiting the place is free.
To access the view, go left into the courtyard next to the Time Out Market.
The terrace is usually not crowded.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.