My girlfriend and I stayed at David's place for almost a week towards the end of our trip around Spain. We did not see David much but he was a wonderful host and very flexible, arranging for someone to come get us settled in as he was out of town the day we arrived.
The apartment was very clean and just as described. The room was good sized for a travelling couple and the balcony was a really nice bonus. We were especially lucky to watch the fireworks from it for the final celebration of La Merce!
There are a number of good breakfast places around the area and the metro is just a block away which was extremely convenient. In all we were very happy with our stay and would highly recommend David's place to anyone looking to spend time in Barcelona!