The flat was exactly as described and in a good central location for me during my time in Madrid.
Elsa always replied within 30 minutes of me messaging, and upon arrival in Madrid it was the same.
I was met at the flat at the agreed time and shown around the flat as well as given some relevant information about Madrid. The flat was also well stocked.
Overall a really excellent experience and she even made the check-out easy, especially given that I had an early morning flight.