You might decide to go for flowering climbers like jasmine or clematis for that wonderful scent or keep it simple with ivy or Akebia quinata (chocolate vine) which work well in shaded areas.
With the added heights of a balcony, you may experience higher winds too. It’s an idea to consider plant varieties that can withstand wind, especially if you are situated in an exposed area.
Typically, these plants have leaf moderations, such as needles, small leaves or furry surfaces, which have developed to help them cope with the drying effects of wind.
Windbreak plants can also offer a level of screening for your privacy as well. Go for Pinus mugo (mountain pine) or even an evergreen such as viburnum to give you a little shelter from the weather.