Once you realise that paragraph 130 (The upstairs landing) is probably missing the exit down the (obvious) staircase, and you correct this by adding in a 'down the stairs to 60' line, this adventure is excellent fun for a beginner. If you do not realise this oversight, it means that the game becomes basically impossible, repetitive and frustrating.
The best things about this are that you can actually use beginning, freshly rolled, characters and not die within the first two paragraphs, and that you do not have to bother shopping for weapons and armour. everything that you need is here.
I gave it a 4 and not 5 due to the sheer frustration of spending about an hour trying to find important items that can be found on ground level, but being unable to access them, owing to to fact that the main house staircase became invisible for no reason.
The limited amount of random encounters is something else that a house rule might be needed to address, as the sense of urgency seems to peter out as the amount available get used up.