My family (including a 10 and 8 year old) spent several days in Barcelona. We selected Antonio's place due to the layout, the location and the reviews. On all fronts, we were very happy. The place was modern and spotless (like in the pictures) with a great set-up for our kids (their own beds and a sizable bedroom) and the location was perfect (a block away from great food and activities, with the Metro only a few blocks away).
The only significant hitch (at it was significant!) was the building lost power one evening - and the power company was unable to get the power back on for nearly 24 hours. Unfortunately, due to a Barcelona heat wave, this led to a sleepless night. And yet - Antonio and his team were responsive upon my reaching out, updated me with the status (unfortunately the utility kept incorrectly gauging when power would return), and finally secured another unit for us - very similar in layout - picked us and our luggage up, drove us to the new unit, refunded us for the sleepless night, and picked up / stored our luggage on the day we departed. Really went above and beyond - he took a bad situation and made it as good as he could.
Thanks to Antonio and his entire team!