This apartment is in an outstanding location - close to everything. We did a lot of different activities in Barcelona over our four day stay. Most everything was close ... within easy walking distance. Dining, sites, shopping are all outside the front door. Anything that was not within walking distance was easy to get to via public transportation.
The apartment is about a block from Catalonia Plaza - a beautiful plaza and a major transportation hub for Barcelona. If you are traveling by airplane, it is convenient and very cost effective to travel from the airport to the apartment via Aerobus.
For fellow American travelers, note that this is an European apartment, not an American apartment. Therefore, you will get one towel per person, the kitchen is equipped with all of the basics, the washer/dryer are standard European size, and all electrical outlets are 220 volt.
If you are renting all four bedrooms, you should know that you will be renting two side-by-side apartments - two bedrooms each. There are two kitchens and 2 1/2 bathrooms. The apartments are connected via a common door and feels like one apartment.
The closest grocery store is within about 2-3 blocks However, it is not easy to find. It is near Carrer del Palau de la Musica, 1, 08003 (Central Barcelona, near Via Laietana) ... located directly opposite the ticket office/outdoor cafe of the Palau de la Musica, off Via Laietana.
One final note. We traveled to Barcelona during the period of the independence referendum activity. Eduardo was HUGELY responsive as we sent him a number of email messages regarding what was happening in Barcelona and whether it was safe to travel. I'm happy to say that it was perfectly safe while we were there.
It's a beautiful city and this is a great apartment to serve as your home base in the city.