We really enjoyed our stay at Luis place. The park, river and trails just across the street are really amazing. The apartment is just far enough from the city to be less touristy, crowded and noisy, but still convenient to the Piramides metro/train station which gives you access to central Madrid in about 5-10 minutes. At the end of the trip, we were able to walk 5 minutes to the Piramides train station and take the C-1/C-10 train directly to the T4 terminal at the airport.
It's also worth mentioning that the A/C worked great, with separate units in the living room and 2 out of 3 bedrooms. There is also a large grocery store (not just a mini-market) right outside the front door to the building.
The hosts were also nice enough to leave a bottle of water and some sparkling wine for us, which was a nice kick-off for our stay.