The apartment is clean and well equipped. 5 minutes walk from Metro La Latina / 12 minutes from Plaza Mayor.
You might not be able to sleep with the windows open, as they face the main street with traffic and shops downstairs.
Check-in and out worked perfectly well.
Parking in the surroundings (and in Madrid generally) is quite tough.
For the food I would recommend Mercado San Miguel (opens till midnight)
For grocery - Dia 5 minutes walk up the street.
Thank you to Eduardo y Raul for hospitality.