Leonor's place was great. The location was perfect for us as we wanted to visit The Prado and it was maybe a 20 minute walk.
When we arrived Leonor and her roommate were there to greet us and give us a tour. Got to practice my Spanish as her English wasn't great (though my Spanish isn't a lot better :). Our hosts were very friendly, even though we hardly saw them again after that.
The room was comfortable, the apartment spacious, the balcony lovely. Unfortunately Madrid was not cooperating - it was bloody hot. Like 37 degrees or so. Not Leonor's fault. I would definitely stay there again, but would check the weather Forecast first :). Actually I would try to visit Madrid next time in the Fall or Spring!
Major bonus: she has a guitar!