We had a great stay in Cesar's apartment. We were travelling with a four-month-old baby and Cesar was very kind in providing a cod with sheets for us.
His son met us on the day of arrival and gave much information about nice restaurants and interesting places to visit. There was a map with remarks waiting for us, which was very helpful.
The apartment was very clean and spacious and nicely decorated. Even the baby got a good night rest.
The location of the apartment was excellent, around the corner of the Museo del Prado and very close to nice restaurants. If we return to Madrid, we will certainly try to stay here again.