Great AirbnB in the centre of Madrid! It's perfect if you like to discover the city on foot, but the metro and a bus stop are nearby as well. The appartment is located on a busy street, I felt safe even late at night. Several good restaurants and cafés are just a building or two away. There are also two supermarkets on the same street.
Carmen is a exceptional host, she goes above and beyond to make your stay enjoyable. The whole appartment was very clean. The only negative aspect here is the obvious one - the window is tiny and doesn't really allow to air the room or cool it down during the night. I stayed in September when temperatures already dropped quite nicely at night, but I still needed the fan. I would recommend staying here 100% if you are not travelling during the hottest weeks of the year.