Angel's place was awesome. We arrived in Barcelona a day earlier than our reservation (we stayed a 10 minute walk away) and it was super easy arranging a meet up time with his rental managers. This was a godsend considering we were traveling with our 2 year old son. Any inquiry leading up to our stay was met with detailed and timely responses.
The apartment itself is in a great location to walk to many attractions or if you prefer a cab, they were easy to hail right outside the door. It was clean and modern and toddlers will love the terrace, a perfect opportunity for them to drop things like toothbrushes and sunglasses down to the pavement 5 floors below. There is also a great little market to grocery shop at, it seems to be owned by an older couple and we stopped there several times. The apartment has every utensil needed to cook meals there.
Our recommendations would be to bring extra blankets if it will be cold, extra towels or clothes pins so you can wash yours if staying longer than a few days...also, a sound machine if you are traveling with kids (we never leave home without ours, thankfully).
Oh, and if you're traveling with kids and have a stroller, do not bring a large one...the elevator is TINY and the apartment is 5 floors up.
Overall, a great place and we would totally stay there again.