The apartment is in a nice residential area of Barcelona, couple of minutes walk from a major Metro station, very safe area, plenty of restaurants around. You have one lock for the building door, then key code in the elevator, and then lock to your apartment, so we felt very safe. The condition of the apartment is nice, pictures on the web represent the reality.
Our host Merce was really good! She was on top of things throughout the Airbnb reservation process, answering all our questions. Upon our arrival, the other host Francis waited for us to check us in, went through all the amenities in the apartment, answered all our questions. Merce later on sent us a good list with recommendations about places to eat, tapas, etc.
My wife and I spent 3 nights at this apartment, and we are definitely going back.