The apartment is very beautiful and spotlessly clean. We loved that Antonio was there to greet us in person and took the time to give us tips about Madrid. We were also able to drop off our luggage before check-in time.
The neighborhood is great, we walked almost everywhere and there are lots of nice shops, restaurants and coffeeshops around.
The only downside is that we experienced a lot of noise during the nights and early mornings, both on the street as in the staircase of the building.