We really enjoyed our stay and Juan's place. His son Alfonso met us at the apartment and walked us through everything we needed to know about the area.
I would recommend this apartment without hesitation if you are looking for an active area. You are literally steps from all of the conveniences you need. Lots of shopping and restaurants, and a very short walk to the metro. There is a very active nightlife scene in Catalunya square (about a ten minute walk). As busy as things were around us, we never had an issue with street noise while we were in the apartment.
Overall, this was a great place to stay and we will certainly look to book with Juan on our next Barcelona adventure.