My boyfriend and I stayed 6 nights at Carla's place and we really enjoyed our stay ! The flat is quite big and nice, the room is great and a bit isolated from the rest of the appartment so it's more intimate. Carla and her sister Celia are amazing : they really have a sens of hospitality, they are really helpfull (Carla offered me to use her bike because she had an injury and had to rest ; Celia explained me in details how to go to the top of Tibidabo) and smiling all the time. Their friend Stefano who welcomed us because Carla couldn't be here was really nice too and he speaks also French !
The flat is located in the beautiful district of Gracia, closed to Placa del Sol and Placa de la Vila de Gracia where you can take coffees, eat or have a drink. The metro station and FGC are close and you can easily go to the old districts of Barcelona, to Sagrada Familia, but also to Park Guell or to the mountain like Tibidado where you will have an amazing panoramic view of the city !
We will definitly return to Carla's place if we go back to Barcelona !