It happened on my parents summer house. My room has a big glass door on the balcony and the apartment on the opposite site is less than 5m away with full view to the bed if my curtains are not closed.
Every day after I got back from the beach for my morning Swim (or before sleeping at night), I took a bath, go into my room, close the curtains and the door, put some porn on the laptop, lube my dick and hands and jacked off.