Was looking for something similar and found your post – not sure about the map link out, but on the content not being shown when the marker is clicked, did you include content inside the marker div?
Such as:
<?php
$location = get_field('address');
if( !empty($location) ):
?>
<div class="acf-map">
<div class="marker" data-lat="<?php echo $location['lat']; ?>" data-lng="<?php echo $location['lng']; ?>">
<?php echo $address['address']; ?>
<?php echo $address['lat']; ?>
<?php echo $address['lng']; ?>
</div>
</div>
<?php endif; ?>
