The location is very good, really close to a central tube station that will take you everywhere. A walking distance from the main touristic points such as Sagrada Familia (10min), Plaza Cataluña, Passeig de Gàcia...
You will need to sign a contract as soon as you walk in with your details. Be aware that there are surcharges for late check-in that need to be paid as soon as you walk in, otherwise they will make you walk to a cash point to get it.
The flat was not the cleanest and there is barely any natural light going in. Also, remember this is a loft, so everything is in the same room: kitchen, dining room, living room and bedroom. The bathroom is in the middle. We mentioned the lack of cleanliness and they denied it, but accepted to send someone to "clean" it again. It was still dirty, but more acceptable, though they used the fact that we had put our suitcases on top of the sofa (as we wouldn't use the wardrobe as it had hairs in it) to try and blame us for old liquid stains on it. We can only presume that this was an attempt to have a counterclaim in the event that we claimed compensation for the lack of cleanliness.