We spent a week at this appartment in May. The appartment is indeed nice and has everything you need for a pleasant stay. The neighbours are loud, but they're unnoticable after a long strolling around the city and sightseeing, you'll probably be too tired to mind them.
The bed is super comfy. The appartment is a bit dark, is surrounded by walls from every side, so you don't get any daylight inside.
In overall, the appartment is good and is perfect for two to have a nice small holiday in Barcelona feeling like home :)