The appartment is beautiful, you can rely on the pictures. Arturo is a very convenient host, always responding to your questions.
However the sofa was a little bit tiny for 2 adults and there was no blackout curtain in the living room. There wasn't enough hot water in the shower for 4 people and not enough coffee capsules for all of us during our stay. So I wouldn't recommend this appartment for 4 people, but it's a very nice place if you want to walk everywhere in the city. We really enjoyed our trip in Madrid thanks to Arturo.