This is the 414th most frequent Finnish word.
keskustassa
"In the city center" or "downtown."
The word 'keskustassa' here describes the general location being discussed, emphasizing the abundance of shops and restaurants in the city center.
Keskustassa on paljon kauppoja ja ravintoloita.
There are many shops and restaurants in the city center.
Here, 'keskustassa' illustrates a location within the central area of the city, indicating where the store is located.
Kauppa sijaitsee kaupungin keskustassa.
The store is located in the city center.
This sentence utilizes 'keskustassa' to define where the described event or condition (bustle) took place.