We stayed at Mark's for 2 nights and were satisfied with everything.
The apartment is 15 minutes walk from the Sagrada Familia, the very center. There are restaurants and grocery stores all around.
The room itself is very clean and so is the whole apartment. Mark is a responsive and pleasant young man. We had no problems at all and have only the best memories of our stay in Barcelona at Marc's place. We had a good time with him, we had a flexible check in and check out. Also, Mark has a dog and a cat that are very cute, they won our hearts.
We recommend Mark's accommodations for a stopover in Barcelona!
Thank you Marc:)