Barcelona's Gothic Quarter (or Barri Gotic) is the center of the old city and one of the largest remaining Medieval neighborhoods in the world. It's one of the most popular neighborhoods among tourists, as there are tons of great restaurants and cafes (many al fresco), bars, and speciality shops with local favorites like fans and espadrilles. Due to their popularity, these restaurants and shops can be very expensive, but happily, there are plenty of budget-friendly hotels in the area. Plus, you'll save money on transportation staying in the Gothic Quarter, as most sights are within walking distance.