My cousins and I had a great stay at Begoña's apartment. The place is bigger than expected, very clean and well located between El Retiro park and Plaza Mayor, next to many restaurants and bars. The balcony is small but it's nice to have an outdoor space and the bathroom is perfect.
However, we regret the absence of a toaster or anything for breakfast, a sponge to wash the dishes, body wash and shampoo. And we had to install the sofa bed ourselves.