Excellent place to stay. As others have said, being on a busy street, it gets pretty noisy particularly on weekend nights.
However, we found it no problem at all. We are not party animals, far from it so we didn't participate in night clubs etc. But we did enjoy this fantastic location. Great to feel like your I the heart of the city.
My girlfriend and I both found the flat clean and better than I expected to be honest. Loved the corner location and three balconies.
Don't hesitate booking. It's the perfect place to explore Madrid!