I went to Barcelona for a 5 with my boyfriend. Having lived in Barcelona previously, I was looking for a central yet quiet flat - and David's is just that. It's right in the center and everything is at a walkable distance, yet the street itself is quiet & peaceful.
The bedroom is comfortable, well-thought and homy. It's perfect for 1-2 people and the small balcony is definitely a plus. The whole flat is thoughtfully decorated! It was very nice to not end up in an Ikea flat, but to be in an arty & original environment. We used the kitchen a couple of times which had everything we needed. Everything was spotless clean too.
David himself was very accommodating, getting out of his way to help us when needed - and yet very chill & laid back. I'd recommend staying there to anyone who's looking for a chill place to stay while in Barcelona.