Overall the apartment was fantastic and just as described. Check-in was super easy as Albert's cousin met us upon arrival, was very friendly and helpful, and spoke great English. Unfortunately, the elevator was broken when we arrived but was fixed the next day. Luckily it was not a problem because Albert's cousin carried my very large bag five flights up to the apartment. Thank you for that! The apartment was well stocked, good explanations were given for how to use everything, beds were comfortable, shampoo and soap were provided, a/c worked well.
The only reason I did not rate it 5 stars is that the walls were thin, and a crying baby next door kept us up at night. I don't know if this happens all the time or if we just had a loud baby next door to us for the weekend. The street noise was not an issue. Also, when the sofa bed was pulled out it was a little wobbly but not really a big deal.
We did enjoy the place very much and thought the location was very convenient for la Sagrada Familia and the subway.