Very well made and well written adventure that really helps invest the characters in the manor. My only real complaint is that the ghost Lif is a tougher fight than the Hag-shadow. Lif is the very first combat in the story and the Hag-shadow is the last, for context. Which kind of juxtaposes the truelly exceptional story against the actual conflicts in the adventure itself. The Hag-shadow is no big set piece battle for a well played group of 3rd level PCs.
However, please don't let my criticism push you too far into the negative on this one. My players had a excellent time and it was a pleasure to run. This book is definetly worth your money if you plan on running Dragon Heist and you want to get the most out of Trollskull Manor.
PS: Find a way to bring Lif back after fighting him. He is one of the coolest "features" of the bar once it gets running and it would be a shame to remove him from the equation.
[5 of 5 Stars!]