The Man Next Door is not very nice to look at. It's not the worst looking thing I've ever seen, but it's just so bland and unattractive.
Audio is a total mess of random sound effects and it's all mixed together pretty horribly.
The story isn't very good, but it at least... has a story. So, I suppose that's more than I can say for the director's other films. There's a clear structure to the story and a resolution, but this kind of story has been done, even before it's release in 1965, and has been done much better (notably, by Looney Tunes).
Overall, there really isn't much enjoyment to be had by watching this. It's just a random mess of simple drawings and simple sound, with a simple, unremarkable story.