Pros: The apartment is so cute and located in a great building in a great location - right across from a grocery store, near lots of shops and restaurants, and most importantly -- very close to several metro stations, making it really easy to get anywhere in Barcelona! We absolutely loved the Sants neighbourhood.
The apartment itself was so cutely decorated, had a lot of natural light, was a great size, and had comfortable beds!
Cons: The Wifi was a little slow at times. As well, unfortunately during our stay there was very loud construction going on right outside of our apartment door, so we had to deal with the noise of that every weekday morning. Because of that construction, the power was cut for the whole building a couple of times during our stay. Although Monica told ahead us of time that there would be a power outage, we had not been warned about the loud construction and were woken up because of the noise in the mornings.
However, this wasn't Monica's fault as she assured me she had not been told about the construction either; all she had been told about was the power outage to the building which she did give me a heads up about right when she was informed.
Although this was disappointing, it of course was not Monica's fault that loud construction was going on in the building and that it just so happened to be right outside of our apartment. And when I brought it up with her, she was SO quick to apologise and offer a partial refund because of the disruptions, which we really appreciated.
Most of the work seemed to be finished by the time we checked out, so I'm confident that although our experience was not perfect, future guests of the apartment will have no issues.