The location is GREAT!!! Within 5 mins walk you are at sagrada familia, from where you've got connections to any place you want to go!
The area is great too!!! So many great restaurants in the area! If you like italian, try "Don Angelo" 2 mins from the apartement, it is amazingly good!!!
The apartement itself is perfect! Its furnishing makes you feel at home and the size is quite big for two persons! It has towels and all the equipment you need to cook a simple dinner.
The only very little thing i would have appreciated to be different was the sponge and the cloth in the kitchen to be new when new guests arrive. But like i said, that's a detail! So i would definitely recommend it to anyone who comes to Barcelona! :)