I've stayed in this apartment twice, and I'd highly recommend it. The location is perfect - very close to museums, restaurants, bars, and public transportation. It is also right down the street from the Filmoteca, one of my favorite Madrid institutions! The apartment itself is very comfortable and functional, and it is suitable for short stays or long stays. (I've done both.) If you plan to work from the apartment (which I did), the WiFi works perfectly. Whenever you want to take a break, the neighborhood has everything you could need. Marta is very nice, and she is very responsive and communicative. I highly recommend the place!