I never got to meet Brian, but his friend Stephanie was a great pseudo host. She and Brian were easy to communicate with, kind, and gave great recommendations. I imagine it would be very nice to stay with Brian in person.
The place itself does have a stunning view that won't disappoint, and its top floor location makes it cool on windy days. However, it's great view comes with a large hill that must be climbed every time you return. Despite the elevator to the top floor, my friend on crutches had a hard time each time we returned, but it isn't hard unless you have reduced mobility.
On location, the apartment is a short walk to a great street with plenty of tapas and pinchos bars. Public transportation to the city center is about an 8 minute walk, which wasn't bad at all. The area is residential, and there is a school right outside the window. It can be noisy when school is in session, but only if you sleep in.
You do share the room with Brian and his second room's guests. There are two bathrooms, and we never had to wait to use one of them.
This is Brian's home. It isn't a sparking clean hotel, but it isn't dirty. There were a few ants in the kitchen and bathroom, but they never bothered us and they were never near the food. Everything else was generally clean and would probably have been cleaner if Brian was home.
There was plenty of food left for us, and his kitchen is great for cooking a meal. The beds were comfortable, and the environment is really relaxing. Overall it really captures the essence of Barcelona and is a fantastic deal for those wishing for a more local experience.