I had a really nice time at Milláns place. I was in Barcelona for a conference at the UPC campus. For that purpose it was perfect for me as the way in the morning was very short (thus a little bit longer in the evening as the restaurants and pubs are a little bit further away). The connection to the Metro was really nice and also taxis are affordable when the Metro is not operating anymore.
The place itself was clean and quiet. The view from the balcony was great and everything in the apartment looked quit new. I did not have too much contact with Millán in person during my stay as he was working and I was also most of the time out. However, he was a really nice host and I had a great experience with airbnb with only a room (and private bathroom!) and not the whole apartment.