Nice little dungeon, but doesn't fit with the feel of Waterdeep Dragon Heist, IMO.
It's a fun house dungeon, with a very similar feel to White Plume Mountain, in fact I think one room was lifted directly from WPM, artwork included.
If your players need a break from the constant social encounters of DH, it'd make sense to run this. I'd change up the ending though, since like WPM the ending is a bit anticlimatic.
Overall it's fine, a couple of the rooms are really fun, and I love the main quest item.