We stayed at 4 Airbnbs during our trip to Spain, and Paula's was our favorite. You can tell that she's put care an effort into both the place and experience, and that is tremendously valuable. The place itself is great. Simple (like most other places in Spain) but lacking nothing. The AC worked great. The location was amazing. And the bed was comfier than all others we slept on during our trip. I seriously can't recommend enough.
The one thing I'll mention for everyone, is that there is no elevator. This wasn't a problem for us, and it seems very common in the center of Madrid, so just be mindful about luggage and the three stories.