Irene was an exceptional host - understanding about our late arrival and generous with our late departure. Her apartment is adorable - really well furnished with lots of nice touches, including coffee and hot cocoa.
The location is terrific - surround by ambiance and a stone's throw from the most important tourist attractions, yet far enough from the street for a good night's sleep.
I would be sure to note that there is no elevator. We found the trek to the 4th floor to be a good dose of exercise after hours of eating delicious tapas, but sore knees or large amounts of luggage might make the setup less desirable.
I would highly recommend this flat and hope to return soon.