The apartment was sparkling clean and very stylish. Carmen was very responsive and quick to help with any questions. You can't beat this location: right in the center of the city with tons of great restaurants and bars, and convenient metro stations (although be aware that the number 2 line is shut down for repairs - locals don't know when it will re-open). Also, the bed was very comfortable, and is a true king-size, which I find is unusual in most European apartments / hotels. A downside is that there can be morning noise because there is a large recycling bin outside where people throw glass bottles (and the garbage truck picks up), which the double-paned windows and wooden shutters don't quite silence. I'm not sure you could find an apartment in the center that is truly quiet, and otherwise - because it's not on a main street - there is very little street noise. In short, I would definitely stay here again, and hope to return to Madrid soon!