My favourite 'Poland's city' (to jest maslo maslane...city in Poland) is Szczecin.
Szczecin has interesting architecture and (tutaj mozesz cos dodac) urban plannED wide streets with trees planted in the island separating (brak przedimka) opposite (tu brak 2 slowa) traffic.
The city holds some exciting cultural events, in my 'submission' (nietrafne slowo, nie jestes w sadzie...mozna opinion), one of the most spectacular events is (przedimek) "Air show" on Dąbie airport.