Alejandra is communicative and cares about the guests. The location of her place is right in the action, with plenty of night life and restaurants around the corner. Most of the attractions are within 10-20 min walk, and her place is close to public transit as well if you want to venture out of the area.
The only cons would be that her bathroom is really small (really really small, barely enough to walk in) and also since the houses in the Gothic quarter are older, all the sound seeps through the walls and windows.
Since she lives right on top of the bar and the central Plaza, that means lots of noise up until 1am, and the cathedral bell rings every hour. If you're planning on staying out late, then it doesn't matter...if you're a early sleeper and early riser, I'd reconsider.
We were here during a national holiday in barcelona, so there was ridiculous loud music playing till 1-2am. That seems to be an exception rather than the norm, and not really her fault.
Overall, her place was great value. Live like a local for a really reasonable price in a central location; hard to beat.