My husband and I stayed in the apartment for one month during summer 2016. It is spacious, comfortable, and architecturally beautiful. It is on a main boulevard near the water with a view of Barcolonetta out the front window/balcony. To the left is Born, and behind the apartment is the Gothic Quarter. It's about a 8-10 minute walk to La Rambla and the Line 3 Metro (Drassanes). There is another metro stop in Barcelonetta about the same distance from the apartment. The apartment has an alley on one side, and at night the downstairs bedroom gets a lot of street/alley noise. We slept primarily in the loft bedroom which was much quieter. The beds are firm and comfortable.
The apartment is above a restaurant in a row of restaurants, and within walking distance of many great cafes, bars, convenience stores, etc. Although there is an elevator in the building, the apartment is on the first floor above the ground floor, and the stairs lead to a hallway with two apartments. We saw people once leaving other apartment, and we didn't hear people coming or going. It is not an apartment building where locals live; it appears to be more of a second apartment type building where some people rent out to tourists. Rarely did we run into people coming or going at the building door (on the alley), but the alley gets fairly regular foot traffic. We felt very secure here.
We cooked in the apartment, did laundry, worked remotely (great internet service), and for the most part recreated our lives in a great new setting. We did not have much interaction with the hosts (Rebeca and her brother Alex), but they were very nice and accommodating. It was definitely a great apartment for us -- bigger than we actually needed.
I recommend the apartment!