I highly recommend Ralf and BA4U apartment rentals for their high level of attention to detail and and professionalism. The apartment was exactly as presented on airbnb and had a wonderful view and excellent security. The neighbourhood was in the centre of Palermo a few blocks from many excellent restaurants, bars and boutiques. Taxis are cheap and plentiful, and there is a subway station a few minutes walk away. You can also take advantage of airport transfers for US$40 through Ralf which I recommend. When you arrive, one of Ralf's staff members will provide an excellent orientation with many useful details.