DataService.java

public interface DataService {
    @Headers({
            "Accept: application/json",
            "Content-Type: application/json",
            "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
    })
    @GET("reviews.json?count=5&page=0&rating=0&sortBy=date_of_review&direction=DESC")
    Call<ReviewResponse> listData();
}

Main.java

    private void doWithRetrofit() {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://www.getyourguide.com/berlin-l17/tempelhof-2-hour-airport-history-tour-berlin-airlift-more-t23776/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        DataService service = retrofit.create(DataService.class);
        service.listData().enqueue(new Callback<ReviewResponse>() {
            @Override
            public void onResponse(Call<ReviewResponse> call, Response<ReviewResponse> response) {
                Log.i("","");
            }

            @Override
            public void onFailure(Call<ReviewResponse> call, Throwable t) {
                Log.i("","");
            }
        });
    }