This is the 7503rd most frequent Polish word.
krakowskiej
"Krakowskiej" means "of Kraków" or "Kraków's" (pertaining to the city of Kraków in Poland).
In this sentence, "Krakowskiej" is used as the locative case of "Krakowska" in Polish, referring to Krakowska Street, describing a place where the action occurred.
Ciężki dom na ulicy Krakowskiej zapadł się po ulewie.
The old house on Krakowska Street collapsed after the rainstorm.
Here, "krakowską" is a feminine singular accusative case of "krakowska" used as an adjective describing the type of sausage.
Zjadłem kanapkę z kiełbasą krakowską na śniadanie.
I ate a sandwich with Krakowska sausage for breakfast.
"Krakowskiego" here is the masculine singular genitive case of "krakowski" used as an adjective indicating origin or relation to Kraków.