We visited in mid-May 2016 and would recommend to anyone visiting Barcelona.
This is a lovely flat (best for a couple or small family) - location is quiet and 'local' - right at Arc de Triomf - and Rosa is wonderful and so much fun!
Right behind the flat you have 2 supermarkets so we were able to make daily breakfast as the flat has everything you need to feel at home from dish soap to coffee and spices/oils to a hair dryer and lots of towels and extra pillows; Rosa even had some 'tinto' waiting upon arrival!
15min walk and we were at Sagrada Familia; the flat is close to Born district with Taco Alto a 5min walk, Mercat Santa Caterina and Museu Picasso a 10min walk; nightlife is great on Passaig Born or you can walk another 7mins past stylish shopping and tons of gelaterias to La Ramblas.
The Gothic area is also close and Rosa's suggestion of Casa Lolea for tapas and sangria was the best we have had in Spain!
Overall, Rosa was very generous and helpful and fun; she keeps a clean, modern, well-appointed flat (exact as in pics) with lots of space to move and the perfect balcony for al fresco relaxation!