The best location, the best hospitality, the best host.
I was skeptical about Madrid but we truly fell in love with the city after staying here. We saw quite a bit of the city but after every night it always felt like it was good to be home.
There are great restaurants and places of interest all within walking distance. There was never a need to take a metro anywhere, as the best parts of the city were within walking distance.
Alvaro went out of his way to explain everything to us, and gave us recommendations and advice. There really isn't much more to ask for. For our first airbnb experience, it truly was a memorable one.