ForeverBarcelona is a very professional and reliable tour company. Marta showed us the Gaudi houses, Sagrada Familia, and Park Guell comfortably in four hours. Because we were with a licensed guide, we slipped ahead of the line everywhere we went. Marta is a really nice person and enjoyable to spend time with. She also knows all kinds of details about the Guadi sites that you could never get otherwise. This tour was absolutely money well spent.