This is a great place to base yourself in Barcelona.
The apartment is roomy and offers a balcony which overlooks the back of the property and is a good sun trap to top up your tan.
There are plenty of small bars and places to eat within a few minutes walk. The cakes at Audrey's bakery are great and offers good coffee.
You are near the Metro station and the first stop on the Aerobus from Barcelona T1 terminal. Plus there are a good selection of buses running from Plaça d'Espanya to get you anyway in Barcelona itself.
The Magic Fountain is worth a look and there are good views and restaurants at the top of the old Bullring just by Plaça d'Espanya. Finally it's worth catching the 150 bus to the top of MontJuic for amazing views of Barcelona and the cable car over to Barcelona beach is worth a try.