My friend and I stayed in Barcelona for 2,5 months and this apartment made our stay even better. It is very well located (we almost went everywhere by walking) and very clean and tidy. All in all it is very lovely, we loved the balcony! This apartment has basically everything you need.
The smaller bedroom is on the side of the Main Street, so it can get a little loud, but the master bedroom is very quiet.
If you are staying in Barcelona, especially for a couple of weeks or even months, we definitely recommend you to stay in this apartment.