Honestly, I don't think you are going to find a bad review here. This is what happens when cartoons hit their apex.
It is stylistic and well animated, visually a pleasure to watch. It gives off a film noir Bogart feel without actually pinning down what era it takes place in... which sets the mood from the opening credits.
The episodes have an actually plot and one that works for, mind the cliche, children of all ages... including children of an adult age. It's never too dark too be inappropriate for kids, and it's never too silly to be boring for teens and adults. It seamlessly walks that happy medium without ever being boring or crossing too far in one direction or the other.
The tone fits the plot, the tone fits the characters, the tone creates the atmosphere that draws you in and it all comes with superb voice acting.
