Me and my sister stayed at Juan's apartment for 9 nights. The two things that we liked mostly about the apartment were its very convenient location (15 min walk to the Bogatell beach and Born & El Gotic districts) and clearness inside. I would also like to underline particularly the hospitality of Juan. He helps his guests a lot, carries about them and are glad to host you at his house. During our stay we felt like we had a very close friend in Barcelona, which is always ready and happy to help you.
Another two things that I personally did not like were that the room (in which we stayed) could not be locked from inside, and that in the announcement of Juan's apartment there was no any info about that there are two rooms for renting in the apartment and not only that room we ordered. I prefer to be able to lock the room during the night, and to know whether I will share the place I will stay at with additional strangers. Overall, we have nothing to complain about and had a great time in Barcelona.