What is the name of this movie?

I'm not sure of the year or actors,but the story is about this boy that falls in love with his female neighbor,and his grandfather tells him the story of how when he (the grandpa) was younger,he waited under a girls window 24/7 until she fell in love with him for his devotion,the boy decides to do this himself and while waiting he watches his neighborhood's resident's bizarre behavior and habits while reading novels (to become a better lover lol)