I stayed for 2 weeks in the room #3. Take note that it has an internal window which doesn't provide a lot of light, so in the morning it's dark and you need to turn on the light basically at any time. Also, the door of the room has a 0.5 cm hole between the door halves, and the room is the closest to the kitchen and the bathroom, so you can expect some noise by the flatmates (and from the outside because from the window you can hear other people talking or partying, and the elevator). I stayed in February so in the evenings it was getting quite cold, but there's a heater in the room.
Apart from that, it's a great place to stay for a short time. All the amenities are present, the room is clean with a good bed. The bathroom and kitchen are very spacious, so there's enough room for all the tenants - you have a personal space in the fridge and the bathroom. Sometimes the bathroom could be not very clean, but it was cleaned quite regularly. The location is great, right next to Arc de Triomf.