My husband and I spent a little over a week at Caroline's place and absolutely loved it! It was just as the pictures appeared with fantastic views of the Sagrada Familia, and the rest of the city. We stayed in late December - early January, so it was a little chilly for us to really enjoy the patios, but they are great spaces to enjoy during the warmer months.
The place was in walking distance to lots of things like markets with fresh fruit, veggies, and more (which allowed us to do some grocery shopping so we didn't have to purchase/go out for every meal), restaurants, and bakeries. We also walked to other attractions like Casa Battlo, Casa Mila, the Gothic Quarter, La Rambla and La Boqueria, etc. Everything was within a 30min walk, which we really enjoyed.
Caroline was very accommodating. Our flight got in earlier than the check-in time, and she made arrangements so we could get into the apartment earlier. I also had two little questions that came up during our stay, and she was very responsive and helpful both times.
I would definitely recommend staying at Caroline's place. It was fantastic!