Hard to believe an intruder would look at that house with all the windows and decide to get the ladder, climb up to see if that particular tiny window was unlocked, then open it and while balancing on the ladder, wiggle through it.
I too think it's ridiculous that an intruder would pick this one particular window to gain access to the house when the downstairs is filled with glass windows that don't have burglar bars. Makes no sense whatsoever.
Or nip up the helpfully-provided ladder to the balcony and in through the open doors ......