Communication with Juan was great, he was in touch prior to us arriving in Barcelona. We didn't actually meet with Juan due to him travelling but we met with his very nice friend who kindly showed us around the apartment and even recommended a really nice restaurant for us to experience true Tapas. The Restaurant was called Bodegueta which is situated on Ram de Catalunya, and it was an excellent choice. If you do intend to stay in Barcelona and want to try tapas from a less touristy place I would definitely recommend this place.
Juan's apartment was lovely, I found it spacious with the 2nd bedroom and seperate living room area. It was also in a fantastic location, the Sagrada Familia is literally just behind the apartment so you will be in a very central location. It was very easy to get around, we experienced lovely weather during our stay so could enjoy walking to where we wanted to go but there are always taxis around if you want to get to your destination quicker.
I will definitely try to stay at Juan's apartment next time I plan to visit Barcelona. It is a great find and at such a great price. I have already been suggesting it to all my friends planning to stay in Barcelona this summer!