We do recommend the apartment.
Pros: Awesome location. Easy access from the international airport (Cercanias or Metro).
Very clean and with natural light. Comfortable bed. Very calm and quiet building. Friendly neighbors.
Cons: very small elevator (maybe only one/two people can fit in. Pay attention whether you travel with a big stroller). It is an attic, so you need to be aware that a portion of the space is not quite easy to walk around. There is no microwave. We had a small problem with the hot water although we were able to fix it thanks to the management's help.