Fantastic neighborhood, but the apartment lacked the super host touch, and I wouldn't exactly call it a penthouse.
I had debated which apartment to book when planning our stay, and booked this one as a "treating ourselves" stretch because of the terrace. The terrace was nice and the apartment clean, but it definitely feels smaller than the apartment looks in the photos, so it didn't feel like the luxurious budget stretch that I was thinking that I was giving to myself and my fiancée for our trip.
I was also a bit disappointed at the lack of hospitality of our host. Hospitality and knowing a local in a new city is usually makes one choose Airbnb over a hotel. When we met the host, he couldn't tell us where the beach was from our apartment and he didn't have us any restaurant recommendations in the neighborhood either. When we asked for more toilet paper (2 rolls for 9 days and 2 people), he suggested buying some at a market. They also didn't provide laundry detergent, which was also unexpected. There was hand soap in the restroom at least, but the lack of amenities didn't feel very hospitable.
Cleanliness: The apartment was clean and bright. I'm terrified of bugs, and so I am glad to have felt comfortable in the apartment.
Coordinating with our hosts: Very easy to communicate with and responded quickly.
Terrace: The terrace is great and felt like our own, even though other apartment building guests have access to it. We never saw anyone else on the terrace in our 9 days staying here.
Neighborhood: The neighborhood of Sant Antoni is fantastic and I would definitely recommend it. We were surrounded by some of the best bakeries, restaurants, and bars in the city. We especially enjoyed the Pinches Tapas places on Career de Blai street, especially L' Angolino. It was super close to the purple subway line (1.5 blocks away), which was easy access to get all around the city, even the airport. If we go back, I might want to stay in the Gothic or El Borne areas instead, because of their "authentic" Barcelona feel and the narrow streets, but Sant Antoni is a vibrant and young and fantastic neighborhood and definitely worth considering.
Also, it's in the description, be but aware of the check in fee.