This is a great location in Barcelona with convenient access (5 min walk) to a couple of metro stations and also within walking distance of several sights (Placa de Catalunya, The Cathedral of Barcelona, The Arc de Triomf, etc.) One highlight is that there are 3 powerful A/C units. One in the living area and one in each bedroom which felt great after long hours of sightseeing in the heat.
One slight disappointment was the terrace. The listing wasn't inaccurate - the terrace is "as advertised", but we didn't find it very comfortable or inviting. There is only a view of an interior courtyard which is mostly noisy and with fumes from nearby smokers. Perhaps if you are only looking for a place to smoke it would be fine, but for us we spent <5 minutes there during our 4 day stay.
The unit is generally quiet, with the exception of early morning noise as people and students were starting their day. We found that if we closed the door to the foyer, it helped.
Finally, the communication with the host(s) was excellent. They always responded within a few minutes and were very proactive about checking with us that everything was fine. Overall, a very smooth stay and I would recommend this place based on the location and great A/C!