We spent 3 nights in Cesar's apartment in the beginning of September'12. At arrival he provided us with a map and detailed instructions on the places to see and to eat at in the area. Extra bed was installed in the bedroom for our 3 y.o. daughter.
We liked everythig about the apartment: location, equipment, hosts.
The refrigerator could be better (the drinks were near room temperature) otherwise the apartment is spotless.
We would definitely stay there during our next trip to Madrid.