Loved our stay in Barcelona. The apartment is very comfortable, well equipped, and a great space to relax after a day of exploring and central to everything. La Rambla and Sagrada Familia are a pleasant walk through the city. There are two great bakeries within a block, a minimarket, and any number of restaurants for dining or take-out - best take out we had were the burgers from foc i oli. But we had other good meals at Napa and even paella from across the street.
When we first arrived, at midnight, and David was kind enough to meet us at the apartment. After settling in, we felt it was loud between noise outside and the sound of the underground rail. Important to remember is that Barcelona is in every way a city and over the days, it blended into the background. When we left we hardly noticed the noise.