Ran this as a one shot a few weeks ago and my players loved it! It took us about 4.5 hours to get through the whole thing. They thought it was a murder mystery/petty drama between the two noble ladies up until they entered Lord Berkestaff's bedroom and were immediately thrown into the craziness of the manor!
I played with 4 level 3 characters and they seemed to manage pretty well.
Overall, we found it was a really fun break from the dungeon delving we had been doing for a while and my players really enjoyed it!
[5 of 5 Stars!]