Located in the heart of Sultanahmet, just 250 meters from the Blue Mosque, 550 meters from Hagia Sophia, this hostel offers free Wi-Fi and air-conditioned accommodation. Castle Hostel A warm welcome awaits you at the small Castle Hostel in Sultanahmet. Guests can enjoy a meal at the hotel restaurant. Rooms at the Castle Hostel. Smoking in certain bedrooms is allowed, as well as in public areas of the hotel. Please specify when making your booking.