That Quest was immediately making it into my Quest Index.
I was calculating it again, in the evening, realizing that I forgot the chaos warriors in the hallways and the wandering monsters
I calculated the Difficulty:

(that means, 4 and a half dice)
That means, if your heroes have four dice and a little bit (like a potion of healing; or having 4 AT and 6 DE dice or if they bring a mercenary), it's playable.
It is also playable as a solo quest with a Hero having

and

if they bring four Mercenaries, one of each type, plus a swordsman extra
A group that just finished the first quest book would have a hard time (not too hard, though... losing 17 BP is tough but not too much so; especially if they are used playing together a lot and have their tactics and the spell ring)
It's worth noting that for the furniture, one needs a little bit extra from either a second Hero Quest game or one of the numerous Kickstarters or Zealot in the last few years. You have 3 extra treasure chests and 1 extra bookcase compared to the base game.
You produced a little
wondering monster there. Love it.

Sadly that picture is gone amiss from the forums.

We should have it as Smiley

I like this quest. It's a solid little side quest, playable, nice layout. Thanks a lot!
And through my little error, we learned:
Ifi you just remove all Chaos Warriors in the Hallways, it is playable by a Hero Group with AT

+ DE

Perfectly adaptable quest.