I actually travelled to the Netherlands mainly to visit the Anne Frank house, it was the main reason and i must say getting tickets is easy enough as long as you do that plenty of time in advance.
I have chosen the tour with introduction which I also recommend, especially if you don’t know that much about history.
The visit took about an hour and although you’re not allowed to take photos inside there is a very good gift shop within the museum where you can buy nice postcards and books