This adventure really struck a chord with me, because I'm about the same age these kids are (assuming one runs it in the '80s) and this is the kind of stuff we would have done. It really hits on all cylinders. I haven't run it yet, but I'm planning on running it as a one-shot on Halloween.
That said, there are a number of problems with this adventure as written. There are a lot of editing errors in it, including one where a page reference was left as "refer to page xx." Also, the room descriptions are kind of inconsistent. The description of the second floor of the house jumps to the attic, then back again, because there (supposedly) is an entrance to the attic in one of the bedrooms. I say "supposedly" because, at least according to the map, there isn't an entrance to the attic there. Really not a big deal, but it makes it confusing.
Also, the map lists a first-floor room as the Family Room, whereas the text refers to it as the Living Room. In the sub-basement room, the area letters on the map don't correspond at all to the text, and the text descriptions are a little vague, which makes it difficult to ascertain what area they're referring to.
Two other issues of note: One, the "Fighting Evelyn" section is separate from the "Battle Against Evelyn" section. These should be combined. Two, on page 19 there's a reference to a book called "Witchcraft and Black Magic," and a loose page from it, then on page 23 there's a reference to Evelyn's grimoire, and a page from it that is a handout. I found this kind of confusing, and wasn't sure whether the page 19 book had the handout, or the grimoire. It seems obvious now, but it was really confusing. Clarifying that would be good, or making handouts for everything on page 19.
One other thing: There's a bathroom described on page 14 as being off a landing partway between the floors. Unless they're using non-Euclidean geometry, I don't see how that's possible, especially because it doesn't show on the map.
These may seems nitpicky, but they made it really confusing for me as I prepare to run it. It's still a great adventure, and I hope they re-edit it and publish a new edition.