Sergio's place is great and we had an awesome stay there. It's bright and open with a very inviting terrace that gets sun from early morning to later afternoon (in Feb). It's a super location, close to lots of streets to explore and places to try out.
There was usually some activity in the street until late at night on weekends but you should know that because it's Barcelona and you are sill central to places people want to be. Just bring earplugs and you're fine. We had a small problem with the magnetic door malfunctioning but they had a locksmith over to fix it immediately.