It’s nice, incredibly detailed like all the Playmobil sets of recent years. Okay. But your son will soon forget about the hot dog cart. The real object of desire (and the only way to get one) is Slimer.
Playmobil was smart enough to keep him separate, so that if you want the ugly little spud you must buy this full set (not that much expensive, honestly, it is perfect for a little present).
Slimer moves his arms in all the directions, unlikely the standard action figures. This makes him incredibly espressive, despite he is not much more than a blob with two arms. I hope the shoulder joints will be strong enough to bear all the possible torsions.
Also critical may be the size of some elements, so small that may be easily lost and hoovered. And I have an issue with the stickers on ketchup/mustard tubes: they tend to unglue and detach, given their size and the surface they are supposed to stick to.
But, again, what matters is that now you have the little green scary thing.