The place is located in a nice neighborhood. It was very close to the Ramblas where we spent a fair amount of time. But it was also far enough from the main streets so we didn't get the rumbles from the tourists even in New Years Eve. The apartment is also conveniently located 2-3 blocks to the Poble Sec metro station which we used a lot to reach far areas like Park Guell.
As for the apartment itself. The walls are a bit thin so we were pretty much enlightened with the life of our neighbors, the little time we spent in the apartment. There is everything that you need in the apartment. The bed was not comfortable. We hardly slept, even though we were tired from tons of walking.