The apartment is run through a company rather than an individual, so picking up keys at their office was easy, and you are comforted by the fact that you have someone there to assist during certain hours of the day if you have any questions. Sito was very quick in responding to any questions.
Location was great. Extremely close to metro. One stop away from Sagrada Familia. In fact, you get a view of the Sagrada Familia from the balcony!
The apartment was exactly as pictured. The bunk beds are in a very small room next to the bathroom, and if you are travelling during hotter months, you might have to keep the doors open to have the AC reach your room. The king room has a TV but we did not use it.
We did use almost all other amenities - laundry (washer/dryer combo in one so it can take a while), we cooked (needed to buy our own olive oil, but they provided some dish soap, sponge, and a cloth for drying), watched TV (difficult to find English channels), and used WiFi (spotty but OK). You may have to buy your own toilet paper and take out your own trash, and we had one bath towel and one hand towel per person and a bathmat. We also had to use our own shampoo/conditioner, but they had hand soap.
Overall, the apartment did its job and it was great for having a convenient area to sleep and a nice living room to hang out in.