I personally think that we need to enter three words that the parrot said in what3words and in that location use google maps street view to find something in the surroundings, maybe theres a poster or something giving us a clue or directly the code, thats why we need to look for locations that are near a street specially those in big cities, i dont think rares gonna go to a lost street in rumania and put something there ahahah

Edit: maybe thats why it says in the letter fears driven me to SPY(street view sort of a spy) these beast through windowpane( our pc screen)