I have a balcony, but I’m not allowed bridge planters because they are considered unsafe. I have some flowering plants in pots, a herb garden made from an old water feature, and some long narrow containers containing strawberry plants and tomatoes. Later I will plant peas. That gives me enough cover for privacy, although as I’m on the fifth floor that isn’t really a problem. You could look into a trellis laid sideways with climbing plants such as honeysuckle, climbing geranium, morning glory and ivy. Herbs and flowering plants such as geraniums, petunias and marigolds will all work in bridge planters, but check with your landlord/leaseholder.