Great apartment, and great location - 15min walk to the Sagrada Familia, less than 10min from two metro stops (you can take the yellow line straight to Jaume then easy walk to Gothic Qtr and La Rambla, or stay on for one or two stops to Barceloneta and the beaches).
Lots of local stores/ bakeries and nice restaurants on Av. Gaudi - listen to the recommendations from Frederic et al!
Apartment was spotless with lovely showers - what is not to like ?! :)