I was able to have a great time in Barcelona with this room, with the need for it being a place to rest at night. The terrace came in useful a couple of times for a spot to go up to and relax.
One thing to note for anyone interested in this unit, it is up a few flights of stairs, so if you have any sort of issues with large inclines than this might not be the unit for you.
Otherwise if you're looking for a cheap stay inside of the city of Barcelona as a single person, this unit would be a great fit for your need, being very close to many things to make your stay enjoyable.