First of all, the location. It's FANTASTIC. Right in the middle of the old town, and 20 steps from the bridge that does directly to the Plaça de la Independència. I don't think you could pick a better spot than this. It comes with a proviso, though! Just note that it's a little difficult to arrive at the apartment with your things. If you map to the Federal Cafe, and drive with confidence past the signs that try to discourage you to do this, you will find a spot to pause to unload.
The apartment is really, really lovely. Lots of space, comfy bed, nicely appointed and decorated. Three balconies, tall windows, lots of light...it's stylish and lovely and - yay! - there's a lift! The kitchen is fairly well-equipped, but do note there is no actual oven, just a microwave. Obviously not much of an issue for a short stay, especially as there are a zillion fun eating opportunities right outside the door.
Will definitely be staying in this one again!