Elsa's place is conveniently located near the airport and offers a private bathroom and very comfortable bed. The place is also very well kept and clean.
With that being said, we did have a couple issues during our one night stay.
Firstly, despite the Airbnb description stating the apartment has air conditioning and a lock on the door, neither were true. In Madrid's 90 degree heat, it was very difficult to sleep without any air conditions or a fan. As for locking the door, we weren't even provided with a key. Elsa was very nice about letting us in when we needed to be, but it is certainly a little strange staying in a place without any keys.
Secondly, our stay got off to a rough start. After misreading Elsa's message, we had some issues accessing the apartment. However, instead of showing some understanding, Elsa came down and scolded us for not knowing how to access her room and unfairly accused us of buzzing the wrong room to get in.
In the end our stay was fine, but certainly not the most enjoyable Airbnb experience.