The location is nicely centered between Font Màgica and La Rambla. You can walk there in about 15-20 minutes, respectively. Walking to the closest subway station(s) takes about 5 - 7 minutes. There are a lot of Pincho bars nearby.
The shared roof terrace was not accessible, the one time I tried visiting it. But other than that, the apartment is pretty much like it shows in the photos.