Best place ever !!!
The apartment is a jewel if you're looking to stay in Madrid center.
I found it more spacious that the photos and really beautiful, personal touches and tastefull decoration.
Kitchen really well equipped and even we were in christmas and the street was always full the windows are soundproof and works really great, our 7 years old son slept with no issue.
Totally recommend it, Marga is an excellent host, responsive and ready to help.
Without any doubt, if you want to experience Madrid as a local, this is the place (I'm from Madrid so I know... )