I stayed at Clara's place with a friend during 7 days and we can be very brief about our stay: just perfect! The communication with her is very good, Clara always responded very fast and inquired about our tastes to make us feel welcome.
Her appartment is very well located. Very close to the subway "La Latina" and to many nice bars and restaurants. (OK, I admit: it can be a bit loud during the weekends when people are sitting outside. But hey, you're staying in the lively city of Madrid, so don't complain. It's a great experience!)
Clara also keeps her place very clean and offers the most wonderful breakfast. She even cooked a delicious meal for us (the typical cocido madrileño) which we shared with her friends: that was a great Spanish afternoon!
Do not hesitate when going to the great city of Madrid: Clara is the perfect host - she's one in a million. It was our first experience with Airbnb and Clara set a pretty high standard.