Amazing experience! I have stayed with airbnb before, but this was the best one so far! The apartment was very clean and elegant, just like in pictures, the location formidable (you can't get enough of seeing Sagrada Familia from your balcony) and the host extremely friendly and helpful, answering all the questions/needs we had. A metro&bus station is situated very close-by, as well as a lot of supermarkets, small shops and restaurants - you'll surely find what you need!
In my opinion, it's the best option you can have in Barcelona, regardless if you're traveling with friends or family. Would totally stay there again and highly recommend Armando and his place!