Joseph was an excellent host. We arrived at around midnight and he arranged for his friend to meet us as he was working himself. He was great at answering our questions promptly and gave us some great suggestions for where to go / what to see.
The flat is very clean and eclectic, as was the room. It's super central and right near Las Ramblas which was perfect for us. The Room is right above 2 bars though which is extremely noisy until about 5am but nothing a pair of ear plugs can't fix... or if you're planning on having a late night yourself.
All in all, we had an amazing time in Barcelona and would definitely recommend staying at Joseph's house.