Just a question. No one knows for sure if doors were closed or open. But let me know if you use to leave doors open (including on latch) when you take holidays? I spent some time in a hotel recently and I always made sure balcony and room's doors were locked before leaving room. If he entered though windows, and he probably did, then he left though them. If not for any other reason at least for the sake of time sparing. Also, windows are 91cm from floor, something quite easy for a 180cm guy to pass though both ways even with a small child.