I recently visited a friend who has just moved in to a new apartment. This is complex has a rule of no washing what so ever. No communal lines, no balcony drying, no courtyard/garden drying. No buts about it. Luckily my friend has enough space to dry inside as well as using the dryer.
I have to say that this complex looked like a resort. It is strict on other rules too such as only one type/colour blinds to be seen from outside. Together with well kept grounds and nothing unsightly to be seen, it looked very neat and orderly. I don’t see how a little washing discreetly placed on a balcony or courtyard would affect the look of this complex. Though it’s when you allow people a little then they display commercial quantities of laundry that the look of a complex could be affected let alone the visual disturbance to neighbours.