Usually building-level
Elevators, garages, shared pools, beach access, common hallways, construction projects and association rules usually affect more than one unit.
Source-reviewed guide
Condo unit review versus building review
Separating unit and building information prevents a great pool from hiding a poor bed—or one unit problem from unfairly describing an entire complex.
Moderated experiences
Usually unit-level
Cleaning quality, mattresses, kitchen inventory, in-unit Wi-Fi, balcony furnishings, photo accuracy and host communication often depend on the exact rental.
Some issues cross both levels
Noise, parking and views may involve both. A useful review explains the exact location and avoids claiming that every unit has the same condition.