Definitely not a place you should find and visit, as it's an abandoned building in really bad shape. But it does provide one of the best rear windows to the city of Porto. Especially on cloudy days. So yes, that's an actual window. And the actual view.
Grace Kelly, before she became HSH Princess Grace of Monaco is pictured in a publicity still for the Alfred Hitchcock classic Rear Window. She starred in only 14 movies over five years, but remains one of the icons of the silver screen.