These apartments are associated with a 5 star hotel around the corner, and as such come with all the amenities you might expect. The location in right in the heart of the Gothic Quarter, which is perfect for exploring downtown Barcelona. There are also nearby subway lines that can take you out into other interesting areas.
Be aware that the rooftop pool areas are communal and close a bit early (8pm in the apartments and 11pm at the hotel). We didn't get much chance to use them since we were out and about.