I stayed at Svitlana's airbnb for one night. It is really super close to the Sagrada Familia, you can see it as soon as you step outside the front door. The bed was comfy and Svitlana was very accommodating, she let me leave my luggage in the flat until the evening on the day of my checkout (thank you!). The flat was very clean and in the kitchen you could make yourself a cuppa or coffee. The flat is well connected with the subway, busses, supermarkets, cafes just outside the flat. I'd love to stay here again when I'm back in Barcelona.