Hello!
We were thinking about 160cm, possibly 180cm
180 cm and then with privacy strips too?
"Prisoner No. 2486 and No. 7486, line up for yard time!"
Sorry, that looks so awful! You can make a 2 m high privacy screen directly on the neighbor’s terrace, ok. but otherwise 100 -120cm fence height. And behind the fence a bed with bushes, bamboo, low fruit trees, sea buckthorn... whatever.
If you also want the terrace to be completely shielded from view, I would simply put a second row of beds with bushes etc. in front of the terrace. With 20 m length of the garden, there is enough space for that.
Best regards,
Andreas