Airbnb is about meeting people and enjoying that and it is what will happen if you go to stay with Atún - or if you catch his mom on a visit to Barcelona. It's been a wonderful pleasure & enrichment to my stay in Barcelona.
I was sceptical to book the room due to the inside window of the room to the kitchen-living room. That is, however, no problem at all. You get both fresh air through the windows in the living room, there's enough privacy and a lovely smell of fresh coffee drifting in is great either to join in or to continue sleeping... I visited in October, so I don't know how warm it gets in summer, but it's an old building with high ceilings, so that should move the air given all windows are open.
Street sounds come in, yet I loved it (it's the Barcelona people and tourists, but no cars). Plus there's this bird in the neighborhood that gets put out on his balcony in the morning and sings. May it live a long happy life ;-)