We absolutely loved staying at Gust's place in Gracia. The neighborhood has a lot of great shops and restaurants, squares to hang out, and is very close to the metro stop to visit the rest of the city. The vibe of the neighborhood felt very local, not as touristy as say the Gothic quarter. You are in an apartment with neighbors, so we just used ear plugs when needed. We also would go to the local market and make meals some evenings with the kitchenette. We had a great time!