Although we arrived at midnight, the arrangement of the late check-in went well. Unfortunately, we didn't meet Marta personally but the agent waited for us, guided us into the apartment and explained everything we should know.
The location of the apartment is perfect - just a few minutes walking from the Plaza Catalunya!
The apartment itself was just fine for a weekend stay. It seemed to be newly renovated including modern facilities and furniture. It was clean and all necessary amenities were available.
Rather negatively is the location at the busy street so that you can hear (and feel) the traffic and metro all day long.
Nevertheless, I recommend this apartment and would rent it again for the next stay in Barcelona.