We stayed 4 days in Mercedes's studio situated right in the heart of Madrid. My friend and I called the district the 8th district of Madrid like the 8th district of Paris.
The studio is spotlessly clean and ordered well.
Mercedes is nice, welcoming and knew how to inform us about places to be visited, restaurants etc....
The studio is situated just a step from the Retiro park (the biggest park of Madrid). We recommend you to visit the park on Sundays.
The place is very well served by the subway and the buses.

Our last advice, if the studio is available you can reserve it unguardedly.

Nuestro último consejo: si el estudio está disponible usted puede reservarlo imprudentemente

Notre dernier conseil : Si le studio est disponible vous pouvez le réserver sans réfléchir