This place is awesome. ...But to be helpful, let me give the good and the bad:
Good: The location is superb. The view from the roof-top terrace is unbelievable. The interior of this apartment is lovely--very well decorated. The bathrooms, in particular, are very nice, with nice tile work and are very clean. The main living room is large, with big beautiful windows, and is a great room. The kitchen is quite small, though nice, and nicely designed. They get a lot out of a small space. The manager, Julia, is excellent: speaks perfect English (she's German), and is very friendly, knowledgeable, and helpful. The security (locks, etc) for the place is great (a little over-the-top, in fact). You feel very safe and secure.
Bad: The great central location and the proximity to the loud Cathedral bells makes it pretty noisy at night (though I think everywhere in the center of the action in Spain has this problem). If you have trouble dealing with noise at night, this will be a problem. The bathrooms are cramped. The top floor bathroom, in particular, is absurdly small (if they would have omitted the bidet, it would have been tolerable, but they didn't, so the bathroom is almost non-functional). Also, the top floor bathroom stinks because of improperly vented plumbing (a very unfortunate and easily avoidable problem that I've encountered a lot). The bedrooms are on the small side. The tall and narrow layout of the apartment has its pros and cons. I liked it, but I imagine some wouldn't want to always be going up and down by elevator or stair.
Overall: Excellent place. I'd stay there again in a heartbeat!