You don't mention the height of the walls or the size of the opening. Would the inexpensive folding garden fencing work? It comes in a variety of heights. Here is what I am talking about: http://www.acehardwareoutlet.com/(rxh2g355udarft45x2gcjx55)/ProductDetails.aspx?SKU=7015068 If the area is partly closed in, a baby gate might suffice?
I was thinking about covering my chain link fence to limit the visibility of the dogs (and hopefully some of the barking). Last year I used the roll-out straw mats from Big Lots and put them on with cable ties. The mats were only $1.00 each. I didn't want to alter the ecosystem in my back yard by cutting off the wind.
You can always put up lattices for growing if it's allowed by the building. I have seen people put strings up and down and grow a good amount of peas or beans this way. It's a thought if there's a balcony above.
On my way to work each morning, there is a house with a front porch. At the beginning of May, lace curtains go up and you can catch glimpses of the inhabitants and/or their pets enjoying the porch when a breeze is blowing. I have been addressing the issue of porch privacy myself, and I like the looks of the lace curtains.
