I stayed for a whole month at the apartment, and overall I enjoyed it.
Pros: location! Great neighborhood with lots of locals, bars, restaurants, stores, and I felt safe walking at night as a woman alone. Check-in was easy. Nice to have all the utilities (kitchen and bathroom) for yourself. The apartment looks new, I think it is renovated not long ago. The equipments are new. Good and quick communication with the owner.
Cons: there were cockroaches. I contacted the owner about it twice. He immediately responded and had someone come over to do something about it (close holes in the wall with cement, use some kind of poison). I haven’t seen cockroaches anymore in the last 10 days, so hopefully it is fixed now. I heard it is a common problem in Barcelona.
Also, I missed fresh air in my room. One window in the bathroom leads to inside the building, so no real fresh air from outside. The door in the kitchen leads to fresh air from outside, but only a couple meters above. So it doesn’t smell very fresh in the room and it is a bit dark during the day (you really need to have the lights on then).