Liz was very kind to let me check-in a couple of hours earlier and to leave my luggage in her living room after the check out until the afternoon. Also, they were super helpful on my requests and very quick to answer on the Airbnb chat.
The place is perfect if you are alone and want to roam around Madrid for a couple of days, as I did, since it is very well connected to the city center and to the train station and metro.