Pro: The apartment was in the best possible location. Within walking distance to the Gracia neighbourhood, which was brilliant. Also metro and busses right nearby. The view outside the living room was amazing. SweetInn was easy and responsive
Con: The apartment is considerably smaller than pictured, especially the hallway and the second bedroom. There was an issue once when we were taking a shower and the water leaked down the apartment downstairs. The check-in and registration process was unecessarily complicated, requiring you to download an app on your phone. We also had to pay a tourist tax and a refundable 300 EUR deposit, which was only revealed after we had made the reservation.
Overall it was an okay experience but for this price I would book somewhere else next time.