In Germany, official government buildings will have the flag on or in front of it, usually next to a bunch of other (eu, county, city...).

Private citizens will fly the flag for sports reasons, or in more right-wing communities they'll fly either the official flag or the old black-white-red one from empire times. Most people will look at you funny for flying the flag when no sports or eurovision are/is going on.
There is really very little "neutral" ground here.