Our stay (couple in the 20ies) was great! The apartment looked exactly like in the pictures and it was very clean. We haven't lived in that part of Barcelona (poble sec) yet and were kinda afraid that it would be not central. However, the apartment is located close to many restaurants (the Blai-street was amazing) and just a few steps away (like 10-15 min by foot) lies the viewpoint of Montjuic from where you have an incredible view over the city and the harbour. It was neither a problem to reach plaza catalunya by foot. So if you are looking for a quiet place that is central - this is your place to be.
Additionally, the host was very friendly and messaged back almost immediately, also giving very good food (and other) recommendations.
Overall it was a wonderful stay and I can fully recommend this place.