Pros:
Location. The location is truly fantastic, close to all the best tapas in the area!
The apartment is clean, but a little more run down than can be seen from the photos.
There is a washer in the apartment (no dryer)
The "separated" apartment layout was good for our group.
Cons:
Beds. The beds are pretty bad. They are very uncomfortable, our backs hurt after each night.
Noise Insulation. You can fairly clearly hear everything that is going on in other floors. Each morning around 9-10am, there was construction going on somewhere in the other floors. It was loud.
There is some mildew smells coming from both bathrooms.