Enjoyed a lovely week at Felipe and Pilar's. The location is phenomenal. We were a short or medium walk to so many places, including Gran Via and Puerta del Sol. And it was a pretty quick trip to the airport by taxi or subway (~30-40 minutes). We enjoyed hanging out at the Moon bar in the Plaza Santa Maria Soledad Torres Acosta, about a 10 minute walk away, and enjoying the shops and little streets along the way.
The apartment is right in the middle of shopping and night life, but as others have said, the apartment itself is pretty peaceful. Close to Tribunal metro stop.
They were doing renovations in the interior courtyard while we were there. This brought additional noise and interference, but the hosts let us know about it in advance when they found out. They handled it with good customer service, giving us a discount for the inconvenience. They're also constructing a multistory building across the street so there's some noise from that during the day.
Felipe and Pilar were communicative throughout, from booking until we checked in. We didn't have need to contact them for any reason while we were there. It felt like the apartment was truly ours while we stayed there.
We used the kitchen for many of our meals. So much better than a hotel! Overall, lovely place and great location.