I'm a Marriot Bonvoy member and was looking for a mid-range hotel in Barcelona. There are two AC hotels, this one on Diagonal and another by the Sants train station. In retrospect, the Sants AC is probably more centrally located to public transportation. However, the AC Diagonal L'illa was a very, very nice hotel which offered a comfortable stay. I appreciated the politeness of the English-speaking front desk staff. The beds are comfy; there is plenty of space (as can be seen in the photographs) and electrical outlets to charge laptops and other electronic equipment. It was, however, the bath towels that left such a deep impression on me for being so darn soft! I wanted to just roll around in them and take them home with me (I didn't, hehe).