I had a quick but awesome stay at Alfonso's place. He's very responsive to my questions and gave me a lot of recommendations from which metro to take and restaurant to eat. He even prepared a nice refreshers and snacks in the room.
The apartment is modern, very clean and well located. It is walkable from the sants station, plaza españa and fira montjüic and very close to the metro. I would highly recommend his apartment and Alfonso as a host.