Julien's home is the perfect place for your budget travel. Despite it being a private room as opposed to a whole apartment, it is fairly priced for the area and offers some comfort and amenities that you may not find at another location or hotel. The area is very central and everything is a fair walking distance and close to transit.
There was some construction going on in the early mornings but we took advantage of our short stay and began our days early anyway. I'd recommend staying here for the solo traveler or a couple, it's a great jump off point to your Barcelona adventure!