Monica's place is as you can expect from the photos, great location, cleanliness, and the apartment itself is incredibly chic.
Pros:
Clean and modern apartment - top notch
Location - The apartment is located one minute away from the Metro station. There is plenty of food nearby (highly recommend trying La Gastromica, and TAPS bar nearby). Also there is a giant supermarket in the basement of the famous Arenas mall. Placa Espanya is perfect to base yourself for a trip to the rest of Barcelona. It is also conveniently located near all the attractions at Montjuic, and the R5 train service that leads directly to the Montserrat Monastery.
Quick response and helpfulness of Monica - She helped us out with all of our queries and she even offered to help us immediately when we had thought we lost some belongings in the apartment.
Value - great for the location
Cons:
The two bedrooms are right next to each other, and the wall is thin, so you can hear the guests in the other room. You also have to step through the corridor briefly to access the bathroom. If you are an extremely private individual, then this may not be ideal. If you don't mind, then there is nothing else negative about the apartment.