The good: The location, 5 minutes walk to the Sagrada Familia is perfect, and it´s close to the metro too. The apartment has some nice touches - the coffee machine with capsules and fridge with beer, juice etc was lovely. The company responded quickly and professionally.
The bad: The apartment is on a big busy street so traffic noise is particularly bad in the front room (we had difficulty sleeping) but also can be heard in the others as the windows aren´t double glazed. It also doesn´t live up to the photos - it felt as though it had been ´stripped´and left with the basics. It´s an old building with a scruffy entrance and it´s much darker than it appears in the light-flooded photos. It´s a flat for 6 but there were only 4 chairs at the table. The flat was cold when we arrived and there were no blankets, extra pillows etc. We chose this flat as it had two bathrooms but with two people showering at the same time the water turned cold so it wasn´t worth it. The flat wasn´t very clean on arrival, with dust and hairs in the bathroom. Please also bear in mind that there are extra charges - 22 euros to check in and you also have to pay if you arrive after 8 o´clock in the evening. We ended up paying almost 300 euros for just two nights. This didn´t feel like value for money.

For these reasons I wouldn´t recommend this flat to friends or family. I would go for a true airbnb experience where the flat isn´t owned by a company, and one which had more home comforts.