Can do too, Germany, the nicer part of the city here. Left my car with open windows in the summer, with my stuff in it, over night, nothing. Wouldn't do it in the northern city though. My seats would've been gone.
I'll raise that by the time I left my car window open for 4 days in a semi big German town.
After police couldn't get ahold of me, a neighbour covered it himself with plastic so the inside wouldn't get wet.