Good communication with the host.
Neighborhood is quiet, apartment is clean and has all the amenities needed (bathroom : shampoo, body lotion, towels).
Kitchen has all the equipment needed, but I would suggest providing some consumables for cooking, like : oil, pepper, spices.
All sights are within walking distance. On one side, 10 min to the city center Puerta del Sol, Atocha neighborhood. On the other side, Retiro Park, El Prado Museum and Reina Sofia Museum.
Only downside, for people with mobility issues, there is no lift to the 3rd floor.
I would recommend staying here.