Corinne's place is wonderful! It's located in an excellent spot, supremely walkable to everything. We literally didn't need to take public transit anywhere, but if we wanted to, it was on the corner (could throw a stone from the front door to the metro) - We finally took the metro on our way out of Madrid to Barcelona to meet someone for a blablacar at another station.
The month we spent in Corinne's adorable studio was cozy and so perfectly located; we walked to El Retiro almost daily, and visited a significant amount of museums, coffee shops, and nightlife. Corinne has made a wonderful studio below her beautiful live/work artist's space, located in the magical Barrio de las Letras - the space is a gem, but more importantly, Corinne is an incredible host. She cooked us a meal and we chatted about Spain, she was always helpful in connecting us to things going on in the area, and when my partner caught a cold she gave her some essential oils to help. She is a very thoughtful host who tends to the find details, ensuring we had enough dishes, regularly cleaned sheets, etc. In addition to Corinne being a welcoming host, her friendly dog Lou Lou is happy to welcome you into their home and so incredibly cute.
There's lots of yoga places nearby, a great indie/old movie cinema across the street, and just about anything you might want to visit is within a 10-15 minute walk. We really couldn't have asked for a better location in Madrid, and certainly could not have asked for a better host.