I've stayed at quite a few Airbnbs and this has by far been my best experience.
The space is as clean as any hotel, and the pictures are very accurate - it's beautiful! It also has amenities that you may find handy: a washer/dryer, dishwasher, iron, hairdryer, great WiFi connection. My sister and I had issues with the heat the first night (our confusion, nothing wrong with the room) and Juan and Nina were both quick to help us out. Within a few minutes I had heard back from them, and an hour or two later they came to set it up!
The location is great. We walked everywhere all week and not once did we take the metro! El Born is about a 10 minute walk, the Sagrada Familia ~15 minutes. Plus it was very close to the city's big park, and I was able to go running in the morning!
Highly recommend - enjoy your trip!