This is a fantastic apartment that you should use! The people in charge of this apartment want to make sure that you explore all that you want in Spain and more. They really go above and beyond to serve any issue you might have. They have an office that's open most days so if you ever need anything more, they're happy to help.I was able to book a taxi with them at a much better rate than I was being quoted in other places. They also are happy to make suggestions about where to go.
The apartment itself was stellar. The balconies look onto the street and it's beautiful. The windows are also pretty much soundproof, which is better than at some places I've been where it can be hard to sleep at night. They provide everything you might want and even have umbrellas for guests to use on rainy days, which was a nice touch. The beds were comfortable and the showers were fantastic.
This is also a great location because you're close enough to the more touristy areas with access to the Metro to go anywhere, but you also still get that cute small-town feel in Sant Antoni. Lots of great tapas places on Carrer de Blai. You can take the bus to the beach from there, catch a Barcelona game (we did but they lost unfortunately), go to Sagrada Familia on the metro, or even visit Montjuic using the funicular on the Metro.
One tip for those who are staying with larger groups, look into getting the t-grup ticket while in the city because it lets you share one ticket amongst all those in your group.