Absolutely awesome stay at Cesar´s place. Location is superb, metro, grocery stores and lots of restaurants nearby. Walking distance to "old center" of city and, depending your feet, lots of museums and parks too.
Apartment is great. Very silent even it is located right next to Puerta de Toledo. Good kitchenware, two showerbooths with enough space to wash yourself without hitting walls and two comfy sofas to rest after climbing up and down Madrid streets.
All the hosts were very nice, caring and super responsive. We had a little issue with one of the keys (two sets of keys, not common in Airbnb), it was handled in no time. Absolutely great "service".
We will definitely book again on next trip to Madrid, no question about that.