Aggregate at the right grain
Neighbourhood and host-level FIXED calculations made comparisons meaningful rather than leaving every chart at listing-level granularity.
Pair overview with precision
The map showed geographic concentration quickly, while the ranked bar chart made exact borough comparison easier.
Keep analytical independence when needed
The borough filter updated descriptive views, while the global host-clustering view remained independent so the segmentation did not change with a local selection.
Use visual design to support interpretation
Consistent colour, annotations and chart roles reduced the amount of explanation required from the user.