We had a great weekend in Carlos' place. Amazing location in the Salamanca area, 15 min by cab from the airport, 10 min walking from Parque de el Retiro and around 20 min walking from all main tourist attractions in Madrid. Also walking distance to some trendy restaurants and bars. The flat itself is very nice, modern and clean - has absolutely everything need! The building has a porter, which was particularly helpful as our flight was delayed and we arrived quite late in the night. Carlos was always responsive and available any time we had a question. Would definitely recommend!