A group of us 6 Americans stayed at Charles' fantastic apartment in Barcelona for 5 days and it was amazing! The place was absolutely perfect:

1) Huge apartment, we could have easily fit another 3-4 people. Each room had its own air conditioning which was really great. 2 large bathrooms with full bath/showers.
2) Centrally located, walking distance to all of the major spots, restaurants, clubs, and beaches. Also located next to several metro stations so easy to use that as well. But far enough away from all the tourists so you could have a real Barcelona experience, quiet at night.
3) Charles was so accommodating to all of us. He showed us all the best restaurants and bars in the city and even made reservations for us at some of his favorite spots.

I will 100% come back and stay at Charles' place whenever I am in Barcelona.