Lovely, convenient little apartment! Very centrally located. We used the Sol station for nearly every outing. It was also easy to use the train and metro to get to/from the airport. Lots of great restaurants, shopping, and sights within a 15 minute walk. Little grocery store right down the street.
The street outside is busy with foot traffic throughout the night, however the windows and shutters do a really good job of blocking out the noise (and making the apartment dark for sleeping). If you are a light sleeper and concerned about the potential noise, bring some earplugs just in case. I think you'll be fine. Bed is comfy. Communication with the host was excellent.
The app used for check in can be a bit finicky to set up initially, but the host reminded us to do that part ahead of time. Which was a good idea. Check in with the app was a breeze upon arrival.
My husband and I stayed here for a long week in early November 2022. Won't hesitate to recommend to others or to book again next time we find ourselves in Madrid!