Location location location! Gracia is a fantastic neighborhood. Apartment is large and comfortable, excellent common space. Only one flight up, which matters because Barcelona elevators are very small, so easy in and out. Two sets of keys great for a group. Christina reserved our taxis for departure day when we arrived so we didn't have to worry about that.
You'll need to pick up your own food supplies, aside from a few spices.
Also- This may be true of all Gracia apartments, but there do not seem to b screens, so opening windows for fresh air will also let in a few mosquitos.
Very comfy place!